Arthur James Downer

Environmental Horticulture/Plant Pathology Advisor Emeritus
Cooperative Extension Ventura County
669 County Square Drive, #100
Ventura, CA 93003-5401
(805) 645-1458
ajdowner@ucanr.edu Create VCard

Links

Biography

  • BSc Cal Poly, Pomona 1981 Botany/Ornamental Horticulture
  • MSc Cal Poly, Pomona, 1983 Biology/Plant Pathology
  • Ph.D. Univ. California Riverside, 1998 Plant Pathology. 
  • CE Advisor in Environmental Horticulture in Ventura County since 1985
  • Adjunct Plant Science Professor, California Polytechnic U. in Pomona since 2013

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Education

Ph.D. Plant Pathology, UC Riverside. 1998

Discipline

Plant Pathology

Specialty

Pathology of landscape ornamentals , Phytophthora Root Rot, Mulches, Potting soils, Palm horticulture, climate ready trees, arboriculture, Master Gardener Advisor.

Areas of Expertise (click to see all ANR academics with this expertise)

Bibliography

Peer Reviewed

  • Downer, A. J. D. Vega and T. Michailides (2022). Botryosphaeria Canker. Agriculture and Natural Resources. 74177. July, 19.
  • Chalker-Scott, Linda; Downer, Arthur James (2022). Garden Myth-Busting for Extension Educators: The Science Behind the Use of Arborist Wood Chips as Landscape Mulches. JOURNAL OF THE NACAA. 15:2. December. https://www.nacaa.com/file.ashx?id=6c7d4542-7481-4f0a-9508-d8263a437348
  • Downer, A. J.; Faber, B. (2021). Amending Landscape Soils. UCANR. 8711.
  • Chalker-Scott, L; Downer, A.J. (2021). Myth Busting for Extension Educators: Reviewing the Literature on Pruning Woody Plants. Journal of NACAA. 14:2, 1-12. December 6.
  • Downer, A.J. and S. Swain and A. Crump (2020). Anthrcnose, UCIPM Pest Notes, Publiction # 7420.
  • Fescenko, A.; Downer, J. A.; Fescenko, I (2020). Persistence of remnant boreal plants in the Chiricahua Mountains, Southern Arizona. Global Ecology and Conservation. Elsevier. 23, 1-10.
  • Chalker-Scott, L.:Downer J.A. (2020). Soil Myth Busting for Extension Educators: Reviewing the Literature on Soil Nutrition. National Association of County Agricultural Agents. 13:2. https://www.nacaa.com/journal/index.php?jid=1134&fbclid=IwAR0cPfBl3V-3car-RPeEmlqzwW8bPEOPgND07xMTNgCOa5GkuSWtdD5WzF8
  • Downer, A.J.; Karlik, J.F. (2019). A Comparison of Two Horsechestnut Street Tree Plantings in Kiev and Pripyat, Ukraine. Open J. Forestry. 9, 255-263.
  • Downer, A.J. and I. Lacan (2019). Armillaria UC IPM Pest Notes UCANR #74171. UCANR.
  • Karlik, J.F.; Downer, A.J. (2019). Comparison of Gamma Ray Dosimeters in a Field Study in the Chernobyl Exclusion Zone. J. of Air and Waste Man. 11, 1361-1367.
  • Takeuchi, T.; Downer, A.J. (2019). Lead absorption by radish is affected by soil texture and cultivar. Open J. Soil Science. 9:4, 65-74.
  • Downer, A.J.; Faber, B. (2019). Mulches for landscapes. ANR publication #8672.
  • Downer, A.J.; Faber, B. (2019). Non-chemical prevention of Armillaria mellea infection of Peach (Prunus persica). Plant Sci. and Phytopathology. 3, 50-55.
  • Downer, A.J.; Perry, E.J. (2019). Wood Decay Fungi in the landscape. ANR publication #74109.
  • Chalker-Scott, L; Downer, J (2018). Garden myth busting for Extension Educators: Reviewing the Literature on Landscape Trees. J. of the National Assn. Ag. Agents. 11:2. https://www.nacaa.com/journal/index.php?jid=885&fbclid=IwAR3fS2iKo8ibifQEDPUrG6UlcB8n-yUgOe6xx1y56MeAcLhP6ZoUkQbUQNg
  • Downer, J. (2016). Native Diseases of California Mediterranean Forest Angiosperms.T. Paine and F. Lieutier. Springer. 529-547.
  • Neila, S.; Akef, S.; Bouzaiane, O.; Kallali, H.; Aissa, N. Ben; M’Hiri, F.; Downer., N. Jedidi and J. (2015). Carbon and nitrogen mineralization in clay loam soil amended with different composts. Advances in Applied Ag. Science 03:20-34. Advances in Applied Ag. Science. 03, 20-34.
  • Downer, A.; Howell, A.; Karlik, J. (2014). "Effect of pruning on eight landscape rose varieties." Acta Horticulturae
  • Downer, A.; Hodel, D.; Matthews, D.; Pittenger, D. (2013). "Effect of fertilizer nitrogen source on susceptibility of five species of field grown palms to Fusarium oxysporum f. sp. carnariensis." Palms 57: 89-92.
  • Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of leaf removal and tie-up on date palms transplanted in extremely hot, arid conditions." Palms 57: 72-78.
  • Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of leaf removal and tie-up on water loss and estimated crop coefficients for juvenile trunkless containerized queen palms." Palms 57: 79-83.
  • Downer, A.; Hodel, D.; Pittenger, D. (2013). "Effect of leaf tie-up and pre-plant storage on growth and transpiration of transplanted Mexican fan palms." Palms 57: 58-63.
  • Hodel, D.; Downer, A.; Pittenger, D. (2013). "Effect of sand backfill on transplanted king, queen, and windmill palms." Palms 57: 63-66.
  • Bennett, P.; Bauske, E.; O'Connor, A.; Reeder, J.; Baush, C.; Kratsch, H.; Leger, E.; Callaghan, A.; Nitzsche, P.; Downer, A. (2013). "Farmers' Market, Demonstration Gardens, and Research Projects Expand Outreach of Extension Master Gardeners." HortTechnology 23: 411-415.
  • Downer, A.; Hodel, D. (2013). "Suitability of ground palm trunk tissues as a medium for growing potted plants." Palms 57: 67-71.
  • Khiari, L.; Neila, S.; Kouki, S.; Rejeb, A.; M'hiri, F.; Hajilaoui, M.; Fumio, M.; Hassen, A.; Jedidi, N.; Downer, A.J.; Ouzari, H. (2012) Control of Fusarium wilt of tomato caused by Fusarium oxysporum f.sp. lycoperscici using mixture of vegetable and Posidonia oceanica compost. Applied and Environmental Soil Science 11 DOI: 10.1155/2012/239639
  • Hodel, D.; Downer, A.; Pittenger, D. (2012). "Effect of container type on the nursery growth of kentia palms and king palms." Palms 56: 65-71.
  • Mayorquin, J.; Eskalen, A.; Downer, A.; Hodel, D.; Liu, A. (2012). "First report of multiple species of the botryosphaeriaceae causing bot canker disease of Indian laurel leaf fig in California." Plant Disease 96(3): 459.
  • Corkidi, L.; Merhaut, D.; Allen, E.; Downer, A.; Bohn, J.; Evans, M. (2011). "Effects of Mycorrhizal colonization on nitrogen and phosphorus leaching from nursery containers." HortScience 46: 1472-1479.
  • Pittenger, D.; Downer, A.; Hodel, D.; Mochizuki, M. (2009). "Estimating water needs of landscape palms in Mediterranean climates." HortTechnology 19: 700-704.
  • Downer, A.; Uchida, J.; Elliot, M.; Hodel, D. (2009). "Lethal palm diseases common in the United States." HortTechnology 19: 710-716.
  • Hodel, D.; Downer, A.; Mochizuki, M. (2009). "Pruning Landscape Palms." HortTechnology 19: 695-699.
  • Downer, A.; Hodel, D.; Mochizuki, M. (2009). "Pruning Landscape Palms." HortTechnology 19: 695-699.
  • Hodel, D.; Downer, A.; Pittenger, D. (2009). "Transplanting Palms." HortTechnology 19: 686-689.
  • Downer, A.; Crohn, D.; Faber, B.; Daugovish, O.; Becker, J.; Menge, J.; Mochizuki, M. (2008). "Survival of plant pathogens in static piles of ground green waste." Phytopathology 98: 574-554.
  • Faber, B.; Downer, A.; Holstege, D.; Mochizuki, M. (2007). "Accuracy varies for commercially-available soil test kits analyzing nitrate nitrogen, phosphorus, potassium and pH." HortTechnology 17: 358-362.
  • Crohn, D.; Faber, B.; Downer, A.; Daugovish, O. (2007). "Probabilities for survival of glassy-winged sharpshooter and olive fruit fly pests in urban yard waste piles." Bioresource Technology 99: 1425-1432.
  • Hodel, D.; Downer, A.; Pittenger, D. (2006). "Effect of leaf removal and tie-up on transplanted large Mexican fan palms (Washingtonia robusta)." Palms 50: 76-81.
  • Hodel, D.; Downer, A.; Pittenger, D. (2006). "Effect of leaf removal and tie-up on transplanted large Mexican fan palms (Washingtonia robusta)." Palms 50: 76-81.
  • Koike, S.; Daugovish, O.; Downer, A. (2006). "Sclerotinia stem and crown rot of celery, caused by Sclerotinia minor, in California." Plant Disease 90: 829.
  • Hodel, D.; Downer, A.; Pittenger, D.; Beaudoin, P. (2006). "The effect of amended backfill soils when planting five species of palms." HortTechnology 16: 457-460.
  • Daugovish, O.; Downer, A.; Faber, B.; McGiffen, M. (2006). "Weed survival in yardwaste mulch." Weed Technology 21: 59-65.
  • Downer, A.; Faber, B. (2005). "Effect of Eucalyptus cladocalyx mulch on establishment of California sycamore (Platanus racemosa)." Journal of Applied Horticulture 7: 90-94.
  • Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2005). "Effectiveness of four commercial mycorrhizal inoculants on the growth of Liquidambar styraciflua in plant nursery conditions." Journal of Environmental Horticulture 23: 72-76.
  • Dahlsten, D.; Dane, K.; Paine, T.; Sime, K.; Lawson, A.; Rowney, D.; Roltsch, W.; Andrews, J.; Kabashima, J.; Shaw, D.; Robb, K.; Geisel, P.; Chaney, W.; Ingels, C.; Bianchi, M.; Varela, L.; Downer, A.; Haviland, D.; Talor, G.; Keller, M. (2005). "Imported parasitoid helps control red gum lerp psyllid." California Agriculture 59: 229-234.
  • Hodel, D.; Pittenger, D.; Downer, A. (2005). "Palm root regeneration and implications for transplanting." Journal of Arboriculture 31: 171-181.
  • Pittenger, D.; Hodel, D.; Downer, A. (2005). "Transplanting specimen palms: a review of common practices and research-based information." HortTechnology 15: 128-132.
  • Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2004). "Assessing the infectivity of commercial mycorrhizal inoculants in plant nursery conditions." Journal of Environmental Horticulture 22: 149-154.
  • Daugovish, O.; Downer, A.; Becker, O.; Browne, G.; Duniway, J. (2004). "Mustard-derived biofumigation for vegetable crops and strawberries." Agroindustria 3: 5-8.
  • Valenzuela-Solano, C.; Crohn, D.; Downer, A. (2004). "Nitrogen mineralization from eucalyptus yard waste mulch applied to young avocado trees." Biology and Fertility of Soils 41: 38-45.
  • Hodel, D.; Pittenger, D.; Downer, A. (2003). "Effect of Leaf removal and tie up on juvenile transplanted canary island date palms (Phoenix canariensis) and queen palms (Syagrus romanzoffiana)." Palms 47: 177-184.
  • Downer, A.; Craigmill, A.; Holstege, D. (2003). "Toxic potential of oleander derived compost and vegetables grown with oleander soil amendments." Journal of Human and Veterinary Toxicology 45: 219-221.
  • Downer, A.; Faber, B.; Menge, J. (2002). "Factors affecting root rot control in mulched avocado orchards." HortTechnology 12: 601-605.
  • Dagit, R.; Downer, A. (2002). To prune or not to prune: recovery of Coast Live Oak after transplanting. 5th Oak Symposium (Proceedings), San Diego, CA, USDA Forest Service.
  • Downer, A.; Menge, J.; Pond, E. (2001). "Association of cellulytic enzyme activities in eucalyptus mulches with biological control of Phytophthora cinnamomi Rands." Phytopathology 91: 847-855.
  • Faber, B.; Downer, A.; Menge, J. (2001). "Differential effects of mulch on citrus and avocado." Acta Horticulturae 557: 303-307.
  • Downer, A.; Menge, J.; Pond, E. (2001). "Effects of cellulytic enzymes on Phytophthora cinnamomi Rands." Phytopathology 91: 839-846.
  • Downer, A.; Hodel, D. (2001). "The effect of mulching and turfgrass on growth and establishment of Syagrus romanzoffiana (Cham.) Becc., Washingtonia robusta H.Wendl. and Archontophoenix cunninhamiana (H.Wendl.)H. Wendl. & Drude in the landscape." Scientia Horticulturae 87: 85-92.
  • Dagit, R.; Downer, A. (1999). "Transplanted coast live oaks (Quercus agrifolia) in southern California." Journal of the International Oak Society 9: 145-150.
  • Downer, A. (1998). The effects of mulch on Phytophthora cinnamomi and Avocado Root Rot. Ph.D. Dissertation. University of California, Riverside, CA. 212.
  • Dagit, R.; Downer, A. (1997). Status of transplanted coast live oaks in Southern California. Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues (Proceedings), San Luis Obispo, CA, Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
  • Dagit, R.; Downer, A. (1996). Status of transplanted coast live oaks in Southern California. Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues (Proceedings), San Luis Obispo, CA, Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
  • Cudney, D.; Downer, A.; Gibeault, V.; Reints, J. (1995). "A non-disruptive technique for kikuyugrass control in cool season turf." California Agriculture 48: 24-28.
  • McGiffen Jr., M.; Greene, R.; Manthey, J.; Faber, B.; Downer, A.; Sakovich, N.; Aguilar, J. (1995). "Field tests of methanol as a crop yield enhancer." HortScience 30: 1225-1228.
  • Faber, B.; Downer, A.; Yates, L. (1993). "Inexpensive, hand-held moisture meters." HortTechnology 3: 195-196.
  • Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1993). "Kikuyugrass (Pennisetum clandestinum) management in turf." Weed Technology 7: 180-184.
  • Bellows, T.; Paine, T.; Gould, J.; Bentley, W.; Coviello, R.; Downer, A.; Elam, P.; Flaherty, D.; Goevca, P.; Koehler, C.; Molinar, R.; Perry, E.; Voegel, G. (1992). "Biological control of ash whitefly: a success in progress." California Agriculture 46: 27-28.
  • Downer, A.; Koehler, C.; Paine, T. (1991). "Biology and management of the eugenia psyllid (Trioza eugeniae Froggatt)." Journal of Environmental Horticulture 9(3): 137-141.
  • Downer, A.; Cudney, W. (1989). "Glyphosate doesn't harm tall fescue." California Agriculture 43: 13-14.
  • Armentrout, V.; Downer, A.; Grasmick, L.; Weinhold, A. (1987). "Factors affecting infection cushion development by Rhizoctonia solani on cotton." Phytopathology 77: 623-630.
  • Armentrout, V.; Downer, A. (1987). "Infection cushion development by Rhizoctonia solani on cotton." Phytopathology 77: 619-623.
  • Downer, A.; Koehler, C.; Svihra, P.; Molinar, R. (1987). "New psyllid pest of California pepper tree." California Agriculture 42: 30-32.
  • Armentrout, V.; Downer, A.; Nameth, S. (1986). "A simplified branching assay for Rhizoctonia solani." Mycologia 78: 657-663.

Non-Peer Reviewed

  • Downer, J. 2022. House Plant Basics. January 14, 2022. https://gardenprofessors.com/wp-admin/post.php?post=12091&action=edit

  • Downer, J. 2021. Pruning Paints Debunked. The Garden Professors. Jan. 08, 2021. http://gardenprofessors.com/wp-admin/post.php?post=11029&action=edit

  • Downer, A. J. (2021).

  • Downer, J. 2021. Why Fresh is Best—when it comes to mulch? The Garden Professors. Feb. 04 2021. http://gardenprofessors.com/why-fresh-is-best-when-it-comes-to-mulch/

     

  • Downer J. 2021. The Contrarian Rosarian—Debunking Rose Mythology. The Garden Professors Mar 05, 2021 …https://gardenprofessors.com/wp-admin/post.php?post=11136&action=edit.

  • Downer, J. 2021. My Soil is Crap. The Garden Professors. April 09, 2021. https://gardenprofessors.com/my-soil-is-crap/

  • Downer, J. 2021. My Soil is Crap—Part II. May 05, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11305&action=edit

  • Downer, J. 2021. Is your landscape sustainable? June 11, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11388&action=edit

  • Downer, J. 2021. Diagnosing Abiotic Disorders I. July 10, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11454&action=edit

  • Downer, J. 2021. Diagnosing Abiotic Disorders II. August 08, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11435&action=edit

  • Downer, J. 2021. Pruning Basics. September 09, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11668&action=edit

  • Downer, J. 2021. Pruning Newly Planted Trees. October 9, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11741&action=edit

  • Downer, J. 2021. Pruning Established Trees. November 6, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11813&action=edit

  • Downer, J. 2021. Pruning Mature Trees. December 11, 2021. https://gardenprofessors.com/wp-admin/post.php?post=11934&action=edit

  • Downer, A. J. (2021). Abiotic Disorders of Trees. Tree Care Industry Association. 33:1, 38-40.
  • Chalker-Scott, L; Downer, J. (2021). Garden myth busting for extension educators: reviewing the literature on landscape trees. Western Arborist. 46:4, 55-63.
  • Downer, A.J. (2021). Mulching. Hawaii Landscape. 24-29. Jan-feb.
  • Downer, A.J.; Hagen, B.; Chalker-Scott, L. (2020). Botany for Arborists:Tree Sex. Western Arborist. Western Chapter International Society of Arboriculture. 45:3, 22-24.
  • E.G., McPherson; Berry, A.M.; van Doorn, N.S; Downer, J.; Hartin, J.; Haver, D.; Teach., E. (2020). Climate-Ready Tree Study: Update for Southern California Communities. 45, 12-18.
  • Downer, A. J. (2020). Fall is for Fungal Fruit. The Garden Professors. October 23, 2020.
  • Ritter, M; Downer, J. (2020). Plant taxonomy and changing tree names. Western Arborist. 46:3, 56-61.

  • Downer, J. 2020. The worms crawl in and the worms crawl out, but these worms kill your plants. The Garden Professors. Posted Nov. 30, 2020. http://gardenprofessors.com/wp-admin/post.php?post=10975&action=edit

  • Downer, J. (2019). Botany for Arborists: Stems. Western Arborist. Western Chapter International Society of Arboriculture. 45:1, 52-60.
  • Smith, K.; Downer, J. (2019). Botany For Arborists:Energy. Western Arborist. Western Chapter International Society of Arboriculture. 45:3, 28-32.
  • Downer, J.; Hagen, B.W. (2019). Botany for Arborists:Leaves. Western Arborist. Western Chapter International Society of Arboriculture. 45:2, 54-60.
  • Downer, J. (2018). Botany for Arborists: Environmental Stress Heat Injury. Western Arborist. 44:3, 16-20.
  • Downer, J. (2018). Dr. James Downer on sabbatical:Parting thoughts on the drought. Western Arborist. 44:4, 50-51.
  • Downer, J. (2018). Pruning climate ready trees. Western Arborist. 44:1, 50-52.
  • Downer, J. (2018). Pruning climate ready trees. Western Arborist. 44:1, 50-52.
  • Downer, J. (2018). The “Rendezvous” an enhanced outdoor education experience. Western Arborist. 44:2, 18-19.
  • Downer, J. (2017). Bot worsens as drought continues. Ventura County Farm Bureau Newsletter. 69:4, 2.
  • McPherson, E.G. (2017). Climate-ready tree study—Update for Central Valley communities. Western Arborist. 42:4, 44-51.
  • Downer, J. (2017). Pruning: some basic concepts. Western Arborist. 42:4, 36-44.
  • Downer, J. (2016). Trees in the Chernobyl Nuclear Exclusion Zone. Western Arborist. 42:1, 42-45.
  • Downer, J. (2015). Botany for arborists: Growth in trees. Western Arborist. 41:4, 56-63.
  • Downer, J. (2015). Botany for arborists: Mulching demystified. Western Arborist. 41:3, 50-54.
  • Downer, A. (2014). "Botany for arborists - Shade trees diseases: A quick overview." Western Arborist 40(1): 34-37.
  • Downer, A. (2014). "Botany for arborists: Canker diseases." Western Arborist 40(3): x-x.
  • Downer, J. (2014). Botany for arborists: Canker diseases. Western Arborist. 40:3, 56-62.
  • Downer, A. (2014). "Botany for arborists: Plant hormones -- How plants and trees regulate their growth." Western Arborist 40(2): 18-19.
  • Downer, J. (2014). Botany for arborists: Plant hormones—How plants and trees regulate their growth. Western Arborist. 40:2, 18-19.
  • Downer, A. (2014). "Botany for arborists: Root rot diseases of trees." Western Arborist 40(4): 56-63.
  • Downer, J. (2014). Botany for arborists: Root rot diseases of trees. Western Arborist. 40:4, 55-63.
  • Downer, A. (2014). Cool weather diseases of nursery crops. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:3. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Fall_2014__Cool_weather_diseases_of_nursery_crops/
  • Downer, A.; Escalen, A. (2014). Disease Focus: Fusarium dieback and the polyphagous shot hole borer. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:1. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/Fusarium_dieback_and_PSHB
  • Downer, A. (2014). DISEASE FOCUS: Scorch diseases caused by Xylella fastidiosa. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:3. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/Scorch_diseases/
  • Downer, A. (2014). "Drought and Tree Diseases." Southwest Trees and Turf 1: 10.
  • Downer, A. (2014). Drought exacerbates root rots. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:2. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Summer_2014__Drought_exacerbates_root_rots_691
  • Downer, A. (2014). Polyphagous shot hole borer look-alikes. UCNFA (University of California Nursery and Floriculture Alliance) News. 18:1. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Spring_2014__PSHB_look-alikes
  • Downer, J. (2014). Presidents Perspective: Passion for Trees: Western Arborist. 40:4, 6.
  • Downer, A. (2013). A comparison of organic fertilizers. UCNFA (University of California Nursery and Floriculture Alliance) News. 17:3. http://ucanr.edu/sites/UCNFAnews/Regional_Report_Ventura_and_Santa_Barbara_Counties/Fall_2013__A_comparison_of_organic_fertilizers
  • Downer, A. (2013). "Botany for arborists IX. Nutrient Management." Western Arborist 39: 42-46.
  • Downer, A. (2013). "Botany for arborists X. How to irrigate Trees." Western Arborist 39(4): 54-57.
  • Stone, H.; Downer, A. (2013). Caring for old native oaks. Technical Information Sheet 3. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFoakis2013.pdf
  • Stone, H.; Downer, A. (2013). Diagnosing and rectifying salt toxicity. Technical Information Sheet 8. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFsalinity2013.pdf
  • Downer, A. (2013). Disease focus: effect of fertilizers on plant diseases. UCNFA (University of California Nursery and Floriculture Alliance) News. 17:3. http://ucanr.edu/sites/UCNFAnews/Disease_Focus/DISEASE_FOCUS__Effect_of_fertilizers_on_plant_diseases
  • Downer, A.; Howell, A. (2013). "Effect of organic fertilizer on .." HortScience xx: xx.
  • Downer, A.; Howell, A.; Karlik, J. (2013). "Effect of pruning on eight landscape rose varieties." HortScience 48: XX.
  • Stone, H.; Downer, A. (2013). Improving soil conditions around existing trees. Technical Information Sheet 5. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFsoilimprovement2013.pdf
  • Stone, H.; Downer, A. (2013). Maintaining palm trees. Technical Information Sheet 7. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFpalms2013.pdf
  • Stone, H.; Downer, A. (2013). Managing infrastructure conflicts with trees. Technical Information Sheet 6. The John Britton Fund. https://www.wcisa.net/Post/Documents/BFinfrastructure2013.pdf
  • Stone, H.; Downer, A. (2013). Managing trees during the drought and water restrictions. Technical Information Sheet 1. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFdrought2013.pdf
  • Stone, H.; Downer, A. (2013). Maximizing the benefits of trees in hot climates. Technical Information Sheet 2. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFhotclimates2013.pdf
  • Downer, A.; Faber, B. (2013). "Pests Move but we should not help them! A reminder to professionals." CAPCA (California Association of Pest Control Advisers) Adviser 16(6): 36-37.
  • Stone, H.; Downer, A. (2013). Planting and early care of trees. Technical Information Sheet 4. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFplanting2013.pdf
  • Stone, H.; Downer, A. (2013). Responsible wood waste management. Technical Information Sheet 9. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFwoodwaste2013.pdf
  • Downer, A. (2013). Snake Oil, Arboricultural Myths, Legends and Persuaders in our Industry. Arboricultural Consultant. 46, 19-23.
  • Stone, H.; Downer, A. (2013). Trees, water and irrigation. Technical Information Sheet 10. The John Britton Fund. http://www.thebrittonfund.org/wp-content/uploads/2012/06/BFirrigation2013.pdf
  • Downer, A. (2013). Ventura County Master Gardeners support agriculture. Farm Bureau of Ventura County. 65:1, 4.
  • Downer, A. (2012). "10 Tips for Healthy Trees." Southwest Trees and Turf 19: 1, 10.
  • Downer, A. (2012). "Botany for arborists VII—Roots: their anatomy and formation." Western Arborist 38(1): 56-58.
  • Downer, A. (2012). "Botany for arborists VIII—The rhizosphere: root interactons with soil, microbial communities for food webs and plant pathogens." Western Arborist 38(4): 56-61.
  • Downer, A.; Karlik, J.; Howell, A. (2012). "Effect of Pruning severity on flowering of landscape roses." HortScience 47
  • Hodel, D.; Downer, A.; Mochizuki, M.; Pittenger, D. (2012). Effect of Sand Backfill When Transplanting Palms. Final Report to California Landscape Contractors Association. Sacramento, CA. http://www.clca.us/research/
  • Mayorquin, J.; Downer, A.; Hodel, D.; Liu, A.; Eskalen, A. (2012). "Ficus branch canker of Indian laurel-leaf fig." Western Arborist 38(1): 60-61.
  • Downer, A. (2012). "Landscape trees are threatened by new diseases." Farm Bureau of Ventura County 64(4): 2.
  • Downer, A.; Hodel, D.; Matthews, D.; Pittenger, D. (2012). "Susceptibility of landscape palms to Fusarium oxysporum f.sp. canariensis under nitrate and ammoniacal fertilization." HortScience 47(9): S84.
  • Mochizuki, M.; Hodel, D.; Downer, A. (2012). "The effect of container type on the nursery growth of kentia palms and king palms." HortScience 47(9): S83.
  • Hodel, D.; Downer, A.; Pittenger, D. (2012). "The effect of leaf removal and tie up on water loss and estimated crop coefficients of juvenile trunkless containerized canary island date palms and queen palms." HortScience 47(9): S82.
  • Hodel, D.; Mochizuki, M.; Pittenger, D.; Downer, A. (2012). "The effect of sand backfill on transplanted palms." HortScience 47(9): S83.
  • Downer, A. (2012). "Trees vs. Turf—Lose/Lose?" Southwest Trees and Turf 19(5): 1, 10.
  • Downer, A. (2012). "Why Trees Die." Western Arborist 38(1): 28-34.
  • Downer, A. (2011). "Botany for arborists Part V: (secondary xylem)." Western Arborist 37(3): 42-45.
  • Downer, A. (2011). "Botany for arborists VI: Phloem, secondary phloem and bark." Western Arborist 37(4): 48-52.
  • Downer, A. (2011). Drought imperils landscape trees. Farm Bureau of Ventura County Newsletter. 65, 2.
  • Hodel, D.; Downer, A. (2011). "Landscape tree diseases: Part 2: Anthracnose disease on Chinese elm." Western Arborist 37(4): 58-60.
  • Downer, A. (2011). Mulches benefit Ventura County agriculture. Farm Bureau of Ventura County Newsletter. 63, 2, 4.
  • Downer, A. (2011). Snake oil, horticultural myths, horticultural urban legends and persuaders in our industry. Topics in Subtropics. 9, 4-8.
  • Downer, A.; Hodel, D.; Mochizuki, M. (2010). "A comparison of “air root pruning” and conventional plastic container for cultivation of two palm species." HortScience 45(8): S106.
  • Downer, A.; Greene, R. (2010). "Affect of above and below grade planting on four landscape trees in Southern California." HortScience 45(8): S129.
  • Downer, A. (2010). Biology and control of Armillaria mellea—the oak root fungus. Landscape Disease Symposium (Proceedings), Camarillo, California.
  • Downer, A. (2010). "Botany for arborists: Part 1." Western Arborist 36(2): 54-55.
  • Downer, A. (2010). "Botany for arborists: Part II." Western Arborist 36(3): 60-61.
  • Downer, A. (2010). "Botany for arborists: Part III." Western Arborist 36(4): 16-18.
  • Downer, A. (2010). "Botany for arborists: Part IV: Plant anatomy." Western Arborist 37(1): 62-64.
  • Downer, A. (2010). "Control of root rot in the landscape with mulches." CAPCA (California Association of Pest Control Advisers) Adviser 13(6): 32-34.
  • Downer, A. (2010). "Diagnosing Landscape Diseases." CAPCA (California Association of Pest Control Advisers) Adviser 13(4): 28-30.
  • Downer, A. (2010). Digital diagnosis. Landscape Notes. 23. http://ceventura.ucdavis.edu
  • Downer, A. (2010). "Drought Survival Tips, Part II." Southwest Trees and Turf 17: 1.
  • Downer, A.; Hodel, D.; Mochizuki, M. (2010). "Effect of deep planting on landscape shrubs." HortScience 45(8): S129.
  • Hodel, D.; Downer, A.; Pittenger, D. (2010). "Effect of leaf removal and tie up on large, mature date palms transplanted in extremely hot conditions." HortScience 45(8): S91-92.
  • Hodel, D.; Downer, A.; Pittenger, D. (2010). "Effect of sand backfill on transplanted palms." Procs. HortScience 45(8): S92.
  • Downer, A.; Faber, B.; Mochizuki, M. (2010). "Effect of soil disturbance, organic matter and Trichoderma on survival of peach in soil infested witih Armillaria mellea." HortScience 45(8): S113.
  • Downer, A. (2010). Hey its conk season keep an eye on your palms. Landscape Notes. 23. http://ceventura.ucdavis.edu
  • Downer, A. (2010). "Organic amendments and sulfur can lower soil pH levels." Farm Bureau of Ventura County 62: 2.
  • Mochizuki, M.; Downer, A.; Faber, B. (2010). "Organic amendments and sulfur in combination reduce soil pH." HortScience 45(8): S91.
  • Downer, A. (2010). Potting media studies. Landscape Notes. 23. http://ceventura.ucdavis.edu
  • Downer, A. (2010). Use of Mulches to control weeds in landscapes. Landscape Notes. 23. http://ceventura.ucdavis.edu
  • Corkidi, L.; Merhaut, D.J; Allen, E.B.; Downer, A.J.; Bohn, J.; Evans, M. (2010). "Use of mycorrhizal colonization to reduce nitrogen and phosphorus leaching from nursery containers." Procs. HortScience 45(8): S88.
  • Downer, A. (2010). "What do you know?" Southwest Trees and Turf 17: 1, 10.
  • Downer, A. (2010). Why Trees Die. Landscape Notes. 24. http://ceventura.ucdavis.edu
  • Downer, A. (2009). "Drought Survival Tips." Southwest Trees and Turf 16: 1, 10.
  • Downer, A. (2009). Drought, "water-wise" gardens and saving water in landscapes. Landscape Notes. 22. http://ceventura.ucdavis.edu
  • Hodel, D.; Downer, A.; Pittenger, D. (2009). Effect of sand backfill on transplanted palms. Report to E. J. Slosson Endowment for Ornamental Horticulture. University of California, Agriculture and Natural Resources. http://groups.ucanr.org/slosson/documents/newsletter1713.htm
  • Downer, A. (2009). Effects of mulches on Trees. Plant and Soil Conference (Proceedings), Fresno, Ca.
  • Downer, A. (2009). Establishing landscape trees. Landscape Notes. 22. http://ceventura.ucdavis.edu
  • Downer, A. (2009). Mulch effects on trees. Landscape Notes. 22. http://ceventura.ucdavis.edu
  • Downer, A. (2009). "Mulch effects on trees." Western Arborist 35: 30-34.
  • Downer, A. (2009). Oaks can thrive with little care. Farm Bureau of Ventura County Newsletter. 59, 4, 6.
  • Downer, A. (2009). "Satisfy trees’ needs to succeed." Southwest Trees and Turf 16: 1, 14-15.
  • Downer, A. (2009). "Snake oil horticultural myths, horticultural urban legends, and persuaders in our industry." Applicator News 24: 4-5.
  • Downer, A.; Faber, B. (2009). Soil Acidification with Organic Amendments and Sulfur. Final Report to the U.C. Hansen Trust. http://groups.ucanr.org/Hansen/documents/2006-200718399.pdf
  • Hodel, D.; Downer, A.; Matthews, D. (2009). "Sooty canker a devastating disease of Indian Laurel-leaf fig trees." Western Arborist 35(4): 28-33.
  • Corkidi, L.; Merhaut, D.; Allen, E.; Downer, A.; Bohn, J.; Evans, M. (2009). Use of mycorrhizal fungi to increase nutrient use efficiency and reduce nitrogen and phosphorus leaching in nursery conditions. Annual Meeting of the International Plant Propagators Society (Proceedings), San Diego, California.
  • Downer, A. (2009). What is wrong with my pygmy date palms?? Landscape Notes. 22. http://ceventura.ucdavis.edu
  • Downer, A. (2009). "What’s wrong with Pygmy Date Palms?" Southwest Trees and Turf 16: 1, 8.
  • Downer, A. (2008). "Controlling landscape diseases." Southwest Trees and Turf 15: 1, 14.
  • Pittenger, D.; Downer, A.; Hodel, D. (2008). "Estimating water needs of landscape palms." HortScience 43: 1060-1061.
  • Downer, A. (2008). "Extension supports ornamental production." Farm Bureau of Ventura County 60(10): 2-4.
  • Downer, A. (2008). Lepidoptera pests of landscapes. Landscape Disease Symposium (Proceedings), Santa Paula, California.
  • Downer, A. (2008). Let the wet begin. Landscape Notes. 21. http://ceventura.ucdavis.edu
  • Downer, A.; Hodel, D.; Pittenger, D. (2008). "Pruning palms." HortScience 43: 1060.
  • Downer, A.; Faber, B.; Mochizuki, M.; Holstege, D. (2008). "Soil pH reduction with sulfur, amendments, and a cover crop." HortScience 43: 1234.
  • Hodel, D.; Downer, A.; Pittenger, D. (2008). "Transplanting and planting palms." HortScience 43: 1060.
  • Downer, A. (2008). "Unraveling the web of soil microbiology." Arborist News 17: 12-16.
  • Faber, B.; Downer, A. (2007). Are all phosphorous products the same? Topics in Subtropics. 5, 3-4.
  • Downer, A. (2007). Controlling landscape diseases. Landscape Notes. 21. http://ceventura.ucdavis.edu
  • Downer, A. (2007). Deep planting kills. Landscape Notes. 20. http://ceventura.ucdavis.edu
  • Downer, A. (2007). Diagnosing Your Oak Tree Part II: Insects. Landscape Notes. 20. http://ceventura.ucdavis.edu
  • Downer, A. (2007). "Diagnosing your oak tree: Part I, Diseases." Western Arborist 33: 34-40.
  • Downer, A.; Hodel, D.; Mochizuki, M. (2007). "Effects of pre-plant incorporation and post-planting application of a palm special fertilizer on five species of landscape palms." HortScience 42: 878.
  • Faber, B.; Downer, A. (2007). Evaluation of commercially available phosphonate products for control of Phytophthora cinnamomi. 11th World Avocado Congress (Proceedings), Santiago, Chile.
  • Downer, A. (2007). "Fusarium wilt pathogen of Phoenix canariensis is a soil survivor." Western Arborist 33: 15.
  • Downer, A. (2007). Gardens are constantly changing. Ventura County Star Newspaper.
  • Downer, A. (2007). "Go out and diagnose those diseases." Southwest Trees and Turf 14: 1, 14.
  • Downer, A.; Hodel, D. (2007). "Leaf removal from Washingtonia filifera does not prevent infection by Phaeochoropsis neowashingtoniae, but does predispose palms to early death from pink rot, Gliocladium vermoeseni." HortScience 42: 978.
  • Daugovish, O.; Downer, A.; Mochizuki, M. (2007). "Mustard derived biofumigation for lettuce in coastal California." HortScience 42: 953.
  • Downer, A. (2007). "New thrips pest attacks Myoporum." Western Arborist 33: 24.
  • Downer, A. (2007). Palm Diseases. Landscape Disease Symposium (Proceedings), Santa Paula, California.
  • Downer, A. (2007). "Palm trunk decays are definitely in California." Western Arborist 33: 15.
  • Downer, A. (2007). Plant Health: A pathologist’s understanding. Procs. of the Landscape Disease Symposium, Santa Paula, CA.
  • Downer, A. (2007). Plant Health: A pathologist's understanding. Landscape Diseases Symposium (Proceedings), Santa Paula, California.
  • Downer, A. (2007). "Planting; not a deep subject." Southwest Trees and Turf 14: 1, 14-15.
  • Downer, A.; Hodel, D.; Pittenger, D.; Mochizuki, M. (2007). "Poor postharvest handling and storage of transplanted Washingtonia robusta palms does not slow or prevent establishment in landscapes." HortScience 42: 978-979.
  • Hodel, D.; Downer, A.; Pittenger, D. (2007). "Recent palm horticultural research at the University of California." The Palm Journal 187(39-44)
  • Downer, A. (2007). Research Results: Palm Fertility. Landscape Notes. 20. http://ceventura.ucdavis.edu
  • Downer, A. (2007). "Snake oil, horticultural myths, horticultural urban legends, and persuaders in our industry." Arborist News 16: 30-34.
  • Faber, B.; Downer, A. (2007). "Soil test kits." Western Arborist 33: 55.
  • Downer, A. (2007). The Wintersmith was Here. Landscape Notes. 20. http://ceventura.ucdavis.edu
  • Downer, A. (2007). Use mulches now to save water and prevent weeds. Ventura County Star Newspaper.
  • Daugovish, O.; Downer, A. (2007). "Using palm trunk fibers as peatmoss replacements for container media." HortScience 42: 877.
  • Downer, A. (2006). Abiotic diseases and disorders of landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
  • Downer, A. (2006). Diagnosing Your Oak Tree Part I: Diseases. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Downer, A. (2006). Fusarium wilt pathogen is a soil survivor. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Faber, B.; Downer, A. (2006). "Mulches in avocado." UC Delivers Story
  • Daugovish, O.; Downer, A.; Mochizuki, M. (2006). Mustard-derived biofumigation for lettuce in Coastal California. 2nd Interntional Biofumigation Symposium (Proceedings), Moscow, Idaho.
  • Downer, A. (2006). New thrips pest attacks Myoporum. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Downer, A. (2006). Palm trunk decays are definitely in California. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Downer, A. (2006). "Palms and palm disorders." Western Arborist 32(4): 24-25.
  • Downer, A. (2006). "Palms puzzle pathologists." Southwest Trees and Turf 13: 1, 14.
  • Downer, A. (2006). "Snake oil in horticulture." Western Arborist 32(3): 14-17.
  • Downer, A. (2006). Snake Oil, Horticultural Myths, Horticultural Urban Legends, and Persuaders in our Industry. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Downer, A. (2006). Some factors about soil that you need to know to understand the biology of the oak tree in California. Landscape Notes. 19. http://ceventura.ucdavis.edu
  • Downer, A. (2006). "Where oaks grow." Western Arborist 32: 14-17.
  • Hodel, D.; Downer, A. (2005). A presentation of research findings from the University of California, Cooperative Extension. Palm Research Symposium (Proceedings), The Huntington Botanical Gardens, San Marino, University of California Cooperative Extension, Los Angeles and Ventura.
  • Downer, A. (2005). An introduction to the Fungi—Who they are, how they grow and why they make such good plant pathogens. Landscape Disease Symposium (Proceedings), Santa Paula, California.
  • Downer, A. (2005). "Education: A valuable commodity." Southwest Trees and Turf 12: 1, 14.
  • Downer, A. (2005). "Pruning Oaks." Western Arborist 31: 46-50.
  • Downer, A. (2005). "Some factors you need to know to understand the biology of the oak tree in California." Western Arborist 31: 34-37.
  • Downer, A. (2004). "Blow wind blow." Southwest Trees and Turf 10: 6.
  • Downer, A. (2004). Catastrophic Tree Damage from Wind. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Downer, A. (2004). Dendroctonus valens: The Red Turpentine beetle. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Downer, A. (2004). Disease Notes: Armillaria Root Rot. Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Downer, A. (2004). "Disease notes: Armillaria root rot." Western Arborist 30: 24-27.
  • Downer, A. (2004). Organic Amendments and Mulches for Palms: Mulching vs Amending. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Downer, A. (2004). Palm Tree Management Part I: selecting the right palm. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Downer, A. (2004). Pruning Oaks. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Corkidi, L.; Allen, E.; Merhaut, D.; Allen, M.; Downer, A.; Bohn, J.; Evans, M. (2004). "The use of mycorrhizal inoculants in the ornamental nursery industry." Cohort 6: 6-10.
  • Downer, A. (2004). "What’s up with the redwoods?" Western Arborist 30: 10-11.
  • Downer, A. (2004). What's up with Redwoods. Landscape Notes. 18. http://ceventura.ucdavis.edu
  • Dahlsten, D.; Rowney, D.; Robb, K.; Downer, A.; Shaw, D.; Kabashima, J. (2003). Biological control of introduced psyllids on eucalyptus. International Conf. on Biological Control USDA Forest Service (Proceedings), Publication FHTET – 03 – 05.
  • Downer, A. (2003). Diseases of Palm Trees: Some new some old. Landscape Disease Symposium (Proceedings), Santa Paula, California.
  • Faber, B.; Downer, A.; Menge, J. (2003). Effects of mulch on avocado and citrus. 5th World Avocado Congress (Proceedings), Malaga, Spain.
  • Downer, A.; Faber, B. (2003). "Effects of mulches on trees." Southwest Trees and Turf 8: 1, 14.
  • Daugovish, O.; Downer, A.; Becker, O. (2003). Exploring biofumigational potential of mustards. Annual International Research Conference on Methyl Bromide Alternative and Emissions Reductions, San Diego, CA.
  • Daugovish, O.; Downer, A.; Becker, O. (2003). Exploring biofumigational potential of mustards. 2003 Annual International Research Conference on Methyl Bromide Alternatives and Emissions Reductions (Proceedings), San Diego, California.
  • Downer, A. (2003). "Observations of Fusarium wilt on palms." Pacific Coast Nurseryman 62: 66-67.
  • Downer, A. (2003). Palm Disease Note - Pink Rot. Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Downer, A. (2003). Palm Disease Note: Fusarium Wilt or Not? Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Downer, A. (2003). "Palm disease notes, continued: pink rot." Pacific Coast Nurseryman 63: 66-67.
  • Downer, A. (2003). Powdery Mildew on Oak - It's Everywhere! Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Downer, A. (2003). "Powdery mildew on oak—It’s everywhere." Western Arborist 29: 53.
  • Downer, A. (2003). Pruning to Control Diamond Scale. Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Hodel, D.; Pittenger, D.; Downer, A. (2003). Root system regeneration and resprouting in palms (Arecaceae). Monocots III: The Third International Conference on the Comparative Biology of the Monocotyldedons. March 30-April 5, 2003. http://monoctos3.org/pdf/abstracts.pdf
  • Becker, J.; Chen, X.; Wilen, C.; Downer, A. (2003). Root-knot nematode-destroying microorganisms for home garden and landscape us. Reports of the Elvenia J. Slosson Endowment. 11.
  • Downer, A. (2003). Snake oil: horticultural myths, urban horticulture legends, frauds, and carpetbaggers in our industry. Landscape Disease Symposium (Proceedings), Santa Paula, California.
  • Pittenger, D.; Hodel, D.; Downer, A. (2003). "Transplanting specimen palms: common practices and research-based information." HortScience 38: 836.
  • Downer, A. (2003). Trunk injection with Tribloxystrobin and Myclobutanil to control powdery mildew in coast live oak. Landscape Notes. 17. http://ceventura.ucdavis.edu
  • Downer, A. (2002). "Planting depth—A common and serious cause of tree deaths." Western Arborist 28: 8-9.
  • Becker, J.; Han, P.; Wilen, C.; Downer, A. (2002). Root knot nematode destroying microorganisms for home garden and landscape use. Reports of the Elvenia J. Slosson Endowment. 8.
  • Downer, A. (2002). Survival of fungal pathogens in static yardwaste piles. Landscape Disease Symposium (Proceedings), Simi Valley, California.
  • Pittenger, D.; Downer, A. (2002). "The herbicide contaminated compost issue." California Landscaping: 32-34.
  • Downer, A. (2002). The Herbicide contaminated Compost Issue. Landscape Notes. 16. http://ceventura.ucdavis.edu
  • Downer, A. (2001). Conk season. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Downer, A. (2001). Diagnosing and curing diseases in large specimen trees—A challenge for the arboricultural consultant. Landscape Disease Symposium (Proceedings).
  • Downer, A. (2001). Disease spotlight: Root rot caused by Oxyporus latemarginatus. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Downer, A. (2001). Lerp psyllid news. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Downer, A. (2001). New diseases of known and unknown cause in California landscapes. Landscape Disease Symposium (Proceedings).
  • Faber, B.; Downer, A.; Menge, J. (2001). Phytophthora control with mulches. Gordon Conference. Ventura, California.
  • Downer, A. (2001). Planting depths a common and serious cause of tree deaths. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Dahlsten, D.; Rowney, D.; Erbiligin, N.; Lawson, A.; Roltsch, W.; Chaney, W.; Costello, L.; Downer, A.; Kabashima, J.; Robb, K.; Shaw, D. (2001). Red gum lerp psyllid biological control in California. National Entomological Society Meeting (Proceedings Poster), San Diego, California.
  • Downer, A.; Pittenger, D.; Hodel, D. (2001). "Root regeneration of landscape palms." HortScience 36: 430.
  • Downer, A. (2000). Calcium based control of Phytophthora root rots. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Downer, A. (2000). Death by Compost: response of ornamental plants to toxic organic substrates. Landscape Disease Symposium (Proceedings), Oak View, California.
  • Downer, A. (2000). Grass control in bedding plants. Landscape Notes. 15. http://ceventura.ucdavis.edu
  • Pittenger, D.; Downer, A.; Hodel, D. (2000). Palm root regeneration and its significance in transplanting. Proceedings of the 11th Conference of the Metropolitan Tree Improvement Alliance, Gresham, OR.
  • Faber, B.; Downer, A.; Menge, J. (2000). Phytophthora control with mulches (Poster). Nelson, New Zealand, International Society of Horticultural Science.
  • Downer, A. (2000). Plant Pathogens in organic substrates and disease suppression with mulches. Microbiology of Compost Organic Mulches and Green Materials Seminar (Proceedings), Oak View, California.
  • Downer, A. (2000). Root rot management in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
  • Downer, A. (2000). The role of organic materials in soil nutrient status. Microbiology of Compost Organic Mulches and Green Materials Seminar (Proceedings), Oak View, California.
  • Downer, A. (1999). A new pest of Eucalyptus citriodora. Landscape Notes. 14. http://ceventura.ucdavis.edu
  • Downer, A. (1999). Calcium based control of Phytophthora root rot. Landscape Disease Symposium (Proceedings).
  • Menge, J.; Faber, B.; Downer, A.; Crohn, D. (1999). Compost demonstration project southern California. Use of yard trimmings and compost on citrus and avocado. Integrated Waste Management Board. Publication #443-99-010, 36.
  • Downer, A. (1999). How to be a better Diagnostician: Tools, Tips and Techniques of the Trade. Landscape Disease Symposium (Proceedings).
  • Downer, A. (1999). Phytophthora an unseen meance in the landscape. Landscape Notes. 14. http://ceventura.ucdavis.edu
  • Downer, A. (1999). Roundup - the DDT of the nineties? Landscape Notes. 14. http://ceventura.ucdavis.edu
  • Downer, A.; Menge, J.; Ohr, H.; Faber, B.; McKee, B.; Pond, E.; Crowley, M.; Campbell, S. (1999). The effect of yard trimmings as a mulch on growth of avocado and avocado root rot caused by Phytophthora cinnamomi. California Avocado Society Yearbook. 83: 87-104.
  • Downer, A.; Menge, J.; Ohr, H.; Faber, B.; McKee, B.; Pond, E.; Crowley, M.; Campbell, S. (1999). "The effect of yard trimmings as a mulch on growth of avocado and avocado root rot caused by Phytophthora cinnamomi." California Avocado Society Yearbook 83: 87-104.
  • Faber, B.; Downer, A. (1999). Weed control problems using greenwaste. 51st Annual Weed Science Society of America (Proceedings), Anaheim, California.
  • Downer, A.; Faber, B. (1999). Weed control problems using greenwaste. 51st Annual Weed Science Society of America (Proceedings), Anaheim, CA.
  • Downer, A. (1999). Where have all the flowers gone? Landscape Notes. 14. http://ceventura.ucdavis.edu
  • Downer, A. (1998). Abiotic diseases/disorders of trees and landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
  • Downer, A. (1998). Amendments and mulches for new landscape plantings. Installing New Landscapes –Doing it right the first time!! (Proceedings), Oak View, California.
  • Downer, A. (1998). Another new psyllid pest. Landscape Notes. 13.
  • Millar, J.; Paine, T.; Hanks, L.; Downer, A. (1998). Biological control of the eucalyptus snout beetle. Gonipteras scutellatus. Report of the Elvenia J. Slosson Fund for Ornamental Horticulture 1995-1998. University of California Division of Agriculture and Natural Resources. 53-56.
  • Downer, A. (1998). Flux diseases in trees. Landscape Notes. 13.
  • Downer, A. (1998). Giant whitefly hits Ventura. Landscape Notes. 13.
  • Faber, B.; Downer, A.; Menge, J.; Ohr, H. (1998). Mulch effects on avocado root rot. 3rd World Avocado Congress–1995 (Proceedings), Haifa, Israel.
  • Downer, A. (1998). "Mulches for landscape use." Hawaii Landscape 25: 16-24.
  • Downer, A. (1998). "Mulching influence of the soil environment." Western Arborist 24: 18.
  • Hodel, D.; Downer, A.; Pittenger, D. (1998). Palm root regeneration. Landscape Below Ground II Workshop (Proceedings), San Francisco, International Soc. Arboriculture.
  • Downer, A. (1998). "Phytophthora cinnamomi an unseen menace in the landscape." Western Arborist 25: 27-29.
  • Downer, A. (1998). Plant diagnostic and soil testing labs in California. Landscape Notes. 13.
  • Downer, A. (1998). "The role of soil enzymes in control of P. cinnamomi." Western Arborist 24: 45-46.
  • Downer, A.; Craigmill, A. (1998). Toxicity of oleander derived compost. Report of the Elvenia J. Slosson Fund for Ornamental Horticulture 1995-1998. University of California Division of Agriculture and Natural Resources. 14-16.
  • Dagit, R.; Downer, A. (1998). "Transplanting coast live oaks in southern California." Western Arborist 24: 36-40.
  • Downer, A. (1997). "Aleppo blight." Western Arborist 23: 7.
  • Downer, A.; Menge, J.; Pond, E. (1997). "An enzymatic mechanism for biological control of Phytophthora cinnamomi." Phytopathology 87: 25.
  • Downer, A. (1997). Oh why oh why do my bedding plants die? Landscape Notes. 12.
  • Downer, A. (1997). "Solving the mystery of plant maladies." Southwest Trees and Turf 2: 1, 3.
  • Dagit, R.; Downer, A. (1997). Status of transplanted coast live oaks in southern California. 2nd Interface Between Ecology and Land Development in California (Proceedings), Occidental College.
  • Downer, A. (1997). The role of soil Enzymes in Control of Phytophthora cinnamomi. Landscape Disease Symposium (Proceedings), Oak View, California.
  • Faber, B.; Downer, A. (1997). Yardwaste mulches in avocado and citrus orchards. Pacific Division of the American Association For the Advancement of Science.
  • Downer, A. (1996). Abiotic diseases and disorders of landscape plants. Landscape Disease Symposium (Proceedings), Oak View, California.
  • Downer, A. (1996). Aleppo blight. Landscape Notes. 11.
  • Downer, A. (1996). Chemical turfgrass edging. Landscape Notes. 11.
  • Downer, A. (1996). Eucalyptus snout beetle update. Landscape Notes. 11.
  • Breuninger, J.; Cudney, D.; Downer, A.; Gibeault, V.; Henry, J. (1996). "Kikuyugrass management in turf with turflon ester in California." Down To Earth 51: 1-5.
  • Downer, A. (1996). Lantanna blight is back. Landscape Notes. 11.
  • Downer, A. (1996). Oak drip: another insect problem. Landscape Notes. 11.
  • Downer, A. (1996). Snails 'n mulch. Landscape Notes. 11.
  • Faber, B.; Downer, A.; Sakovich, N.; McGiffen, M.; Cudney, D.; Mills, S. (1996). Yardwaste mulches in avocado and citrus orchards. Report of the Elvenia Slosson Fund. Division of Agriculture and Natural Resources.
  • Downer, A.; Faber, B. (1995). Determining the usefulness of eucalyptus mulches in landscape plantings. Annual Report of the Slosson Endowment. 28-30.
  • Cowles, R.; Downer, A. (1995). "Eucalyptus snout beetle detected in California." California Agriculture 49: 38, 40.
  • Downer, A. (1995). Kikuyugrass fertilization. Landscape Notes. 10.
  • Downer, A. (1995). Oleander poisoning. Landscape Notes. 10.
  • Downer, A. (1995). Organic dust toxic syndrome. Landscape Notes. 10.
  • Downer, A. (1995). Pine pitch canker. Landscape Notes. 10.
  • Downer, A. (1995). Yardwaste mulches and weed control. Landscape Notes. 10.
  • Downer, A. (1994). A new pest of eucalyptus. Landscape Notes. 9.
  • Downer, A. (1994). Effect of mulches and turfgrass on palm growth. Landscape Notes. 9.
  • Hodel, D.; Downer, A. (1994). Effects of mulches on the growth of palms. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
  • Cowles, R.; Downer, A. (1994). "Eucalyptus snout beetle." HortScript 8
  • McGiffen, M.; Manthey, J.; Baameur, A.; Greene, R.; Faber, B.; Downer, A.; Aguilar, J. (1994). Field tests of methanol as a crop yield enhancer. 1994 Western Plant Growth Regulator Symposium (Abstracts).
  • McGiffen, M.; Manthey, J.; Baameur, A.; Greene, R.; Faber, B.; Downer, A.; Aguilar, J. (1994). "Field tests of methanol as a crop yield enhancer." HortScience 29: 459.
  • Cudney, D.; Downer, A.; Henry, J.; Gibeault, V. (1994). Kikuyugrass management in cool and warm season turf. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
  • Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1994). "Low-impact management of kikuyugrass in cool-season turf." California Fairways
  • Downer, A.; Faber, B. (1994). "Organic mulches and amendments for shade trees." Arbor Age 14: 8-10.
  • Faber, B.; Downer, A.; Yates, L. (1994). "Portable soil meters." American Nurseryman 179: 93-94.
  • Downer, A. (1994). Studies on Yardwaste use in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
  • Downer, A.; Faber, B. (1994). "The effect of eucalyptus mulches on germination of annual and perennial weed species." HortScience 29: 555.
  • Downer, A.; Shaw, M.; Pittenger, D. (1994). "The effect of pruning on branch growth in two oak species." HortScience 29: 550.
  • Downer, A.; Cowles, R. (1994). "The eucalyptus snout beetle: a new threat to eucalyptus in California." Western Arborist 20: 18-19.
  • Cudney, D.; Downer, A.; Gibeault, V.; Henry, J.; Reints, J. (1993). "A new, non-disruptive alternative for kikuyugrass management in cool-season turf." California Turfgrass Culture 42: 1-4.
  • Downer, A.; Pittenger, D.; Faber, B.; Rogers, P. (1993). Biosolids increase yield and color of perennial ryegrass when added to yardwaste composts. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
  • Downer, A. (1993). Effects of pruning sycamores. Landscape Notes. 8.
  • Downer, A. (1993). Eucalyptus borer resistance. Landscape Notes. 8.
  • Downer, A. (1993). Eugenia psyllid relief. Landscape Notes. 8.
  • Downer, A. (1993). Grasscycling. Landscape Notes. 8.
  • Downer, A.; Faber, B.; White, R. (1993). Green waste compost for landscaping--a demonstration project. 1993 Plant and Soil Conference. Sacramento, CA.
  • Downer, A.; Faber, B.; White, R. (1993). Green waste compost for landscaping--a demonstration project. 1993 Plant and Soil Conference (Proceedings), Sacramento, California.
  • Cudney, D.; Downer, A.; Henry, M.; Gibeault, V. (1993). Integrated kikuyugrass management in cool season turf. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
  • Downer, A. (1993). "Mulch matters." The Broadcaster 43: 3-4, 24.
  • Downer, A. (1993). Mulching bedding plants. Landscape Notes. 8.
  • Downer, A. (1993). Oleander poisoning. Landscape Notes. 8.
  • Downer, A.; Pittenger, D.; Faber, B.; Rogers, P. (1993). "Sewage sludge increases yield and color of perennial ryegrass when added to yardwaste composts." HortScience 28: 541.
  • Downer, A. (1993). The truth about eucalyptus. Landscape Notes. 8.
  • Downer, A. (1993). Transplanting palms. Landscape Notes. 8.
  • Downer, A. (1993). Trunk temperatures of California sycamore. Ornamental Horticulture Control Conference (Proceedings), Riverside, California.
  • Downer, A.; Koehler, C.; Paine, T. (1992). Biology and management of eugenia psyllid. 33rd Annual Entomology Conference (Proceedings).
  • Downer, A.; Faber, B.; Schuh, U.; Pittenger, D.; White, R. (1992). "Composted and fresh eucalyptus chip mulches promote early establishment of California sycamore." HortScience 27: 686.
  • Downer, A. (1992). Controlling shrub growth. Landscape Notes. 7.
  • Downer, A. (1992). Disease alert. Landscape Notes. 7.
  • Downer, A.; Faber, B.; White, R. (1992). "Effects of hydrophilic polymers and organic amendments on establishment of Kentucky bluegrass." HortScience 27: 588.
  • Downer, A. (1992). Eucalyptus borer. Landscape Notes. 7.
  • Downer, A. (1992). Evaluating soil amendments and polymers for use in the landscape. Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day (Proceedings).
  • Shaw, A.; Downer, A.; Faber, B. (1992). Irrigation scheduling of California live oak (Quercus agrifolia) in a production nursery. 73rd Annual Meeting of the Pacific Division of the American Association For the Advancement of Science (Abstracts). 50.
  • Downer, A.; Cudney, D.; Henry, M.; Gibeault, V.; Cockerham, S. (1992). "Kikuyugrass control in cool season turfgrass." HortScience 27: 676.
  • Downer, A. (1992). Mulching mowers. Landscape Notes. 7.
  • Downer, A. (1992). Polymer studies. Landscape Notes. 7.
  • Downer, A. (1991). Blue gum psyllid is here. Landscape Notes. 6.
  • Downer, A. (1991). Effect of water absorbing polymers and organic soil amendments on performance of cools season turfgrass. Turfgrass Research Conference and Field Day (Proceedings), Riverside, California.
  • Downer, A. (1991). Inexpensive moisture meters do they work. Landscape Notes. 6.
  • Downer, A. (1991). Kikuyugrass control. Landscape Notes. 6.
  • Cudney, D.; Downer, A.; Gibeault, V.; Elmore, C.; Reints, J. (1991). Kikuyugrass control studies in southern California. Turfgrass Research Conference and Field Day (Proceedings), Riverside, California.
  • Downer, A. (1991). Kikuyugrass fertility studies. Landscape Notes. 6.
  • Downer, A. (1991). Mulching project update. Landscape Notes. 6.
  • Downer, A.; Koehler, C. (1990). Eugenia psyllid. Division of Agriculture and Natural Resources. Publication #7190.
  • Downer, A.; Kabashima, J.; Paine, T.; Koehler, C. (1990). "Eugenia psyllid update." Pacific Coast Nurseryman 49: 40.
  • Downer, A. (1990). Eugenia psyllid update. Landscape Notes. 5.
  • Downer, A. (1990). "How to save water in landscapes." The Broadcaster 43: 5, 28-30.
  • Cudney, W.; Downer, A.; Elmore, C.; Gibeault, V. (1990). Kikuyugrass control studies. Turfgrass Research Conference and Field Day (Proceedings).
  • Downer, A. (1990). Kikuyugrass research. Landscape Notes. 5.
  • Downer, A. (1990). More Eugenia psyllids. Landscape Notes. 5.
  • Downer, A.; Ohr, H. (1990). "Palms trees have problems too." Grounds Maintenance 24: 94, 100, 102.
  • Downer, A. (1990). Polymers polymers polymers. Landscape Notes. 5.
  • Downer, A. (1990). Snails snails snails. Landscape Notes. 5.
  • Downer, A. (1990). To mulch or not? Landscape Notes. 5.
  • Ohr, H.; Downer, A. (1989). "Diseases of palm trees." International Society of Arboriculture - Western Chapter News 15: 42-43.
  • Ohr, H.; Downer, A. (1989). Diseases of palm trees. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 26.
  • Downer, A. (1989). Drought effects on turfgrass for 1989. Landscape Notes. 5.
  • Koehler, C.; Downer, A. (1989). "Eugenia psyllid update." Southwest Lawn and landscape 5: 23, 27.
  • Downer, A. (1989). Eugenia psyllids are here. Landscape Notes. 5.
  • Downer, A. (1989). Eugenia psyllids update. Landscape Notes. 5.
  • Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 38.
  • Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. 38.
  • Cudney, D.; Elmore, C.; Gibeault, V.; Downer, A.; Van Dam, J.; Shaw, A.; Cockerham, S. (1989). Management and control of unwanted species in turf. 1988-1989 Annual Report Turfgrass and Ornamentals Research. University of California, Riverside. 38.
  • Downer, A. (1989). Managing turfgrass during drought. Landscape Notes. 5.
  • Downer, A. (1989). New turfgrass diseases. Landscape Notes. 5.
  • Downer, A.; Ohr, H. (1989). "Palm trees have problems too." Grounds Maintenance 24: 94-102.
  • Svihra, P.; Downer, A.; Molinar, R.; Koehler, C. (1989). Peppertree psyllid control. Division of Agriculture and Natural Resources. Publication #7188.
  • Downer, A. (1989). Pesticide training made easy. Landscape Notes. 5.
  • Downer, A. (1989). Pine Pitch Canker in Santa Barbara County. Landscape Notes. 5.
  • Downer, A.; Cudney, D. (1989). "Research shows no residue effects from glyphosate." California Landscape 14: 28-29.
  • Downer, A. (1989). The baccharis beetle is back. Landscape Notes. 5.
  • Downer, A. (1989). The truth about water absorbing polymers! Do they work? Landscape Notes. 5.
  • Downer, A. (1988). Another gazania disease. Landscape Notes. 4.
  • Downer, A. (1988). Disease of palms. Landscape Notes. 4.
  • Downer, A. (1988). Disease of Poa annua on golf courses. Landscape Notes. 4.
  • Downer, A. (1988). Fruit control in ornamental trees. Landscape Notes. 4.
  • Downer, A. (1988). Gazania crown rot. Landscape Notes. 4.
  • Downer, A. (1988). Ice plant failure. Landscape Notes. 4.
  • Downer, A. (1988). More on gazania problems. Landscape Notes. 4.
  • Downer, A. (1988). More on tree injections. Landscape Notes. 4.
  • Downer, A. (1988). Shade tree problems disease or drought. Landscape Notes. 4.
  • Downer, A. (1988). The Eucalyptus long horned borer makes its debut. Landscape Notes. 4.
  • Downer, A. (1988). The most common landscape problems. Landscape Notes. 4.
  • Downer, A. (1988). The new pest of Ash. Landscape Notes. 4.
  • Downer, A. (1988). Weeds in hydroseeded turf. Landscape Notes. 4.
  • Downer, A. (1988). Wood decay in shade trees. Landscape Notes. 4.
  • Downer, A. (1987). Are wood chips hazardous. Landscape Notes. 3.
  • Downer, A. (1987). Boron - what levels are toxic to ornamentals. Landscape Notes. 3.
  • Downer, A. (1987). Diseases of shade trees. The Turf and Landscape Institute (Proceedings), Anaheim, California.
  • Downer, A. (1987). Fungicides how do they work. Landscape Notes. 3.
  • Downer, A. (1987). Inhibition of tall fescue germination by glyphosate (Roundup). Landscape Notes. 3.
  • Downer, A. (1987). Injections for oaks? Landscape Notes. 3.
  • Downer, A. (1987). Kikuyugrass management. Landscape Notes. 3.
  • Downer, A. (1987). "Learn how fungicides work." International Society of Arboriculture - Western Chapter News 13: 15-16.
  • Downer, A. (1987). Peppertree psyllid update - injections and implants. Landscape Notes. 3.
  • Downer, A. (1987). Systemics symposium. Landscape Notes. 3.
  • Downer, A. (1987). Understanding bark beetles. Landscape Notes. 3.
  • Downer, A. (1987). Watering a tricky business. Landscape Notes. 3.
  • Downer, A. (1986). "Anthracnose on Modesto ash." International Society of Arboriculture - Western Chapter News 12: 8.
  • Downer, A. (1986). Armillaria root rot some new information. Landscape Notes. 2.
  • Downer, A. (1986). Ash anthracnose continues. Landscape Notes. 2.
  • Downer, A. (1986). Chemical control of rust (turf). Landscape Notes. 2.
  • Downer, A. (1986). Diagnosing Shade Tree Problems. Landscape Notes. 2.
  • Downer, A. (1986). "Diagnosing shade tree problems." International Society of Arboriculture - Western Chapter News 12: 17-21.
  • Downer, A. (1986). Disease Notes. Landscape Notes. 2.
  • Downer, A. (1986). "Do tree injections work?" Tree Trimmers Log 41
  • Downer, A. (1986). Eucalyptus longhorned borers a threat to Eucalyptus Trees. Landscape Notes. 2.
  • Downer, A. (1986). Fireblight control. Landscape Notes. 2.
  • Downer, A. (1986). More on hazardous trees. Landscape Notes. 2.
  • Downer, A. (1986). More on insects. Landscape Notes. 2.
  • Downer, A. (1986). Oaks are affected by many insects. Landscape Notes. 2.
  • Downer, A. (1986). Pepper Tree Psyllid Update. Landscape Notes. 2.
  • Downer, A. (1986). Pepper tree psyllid update. Landscape Notes. 2.
  • Downer, A. (1986). Peppertree psyllid update. Landscape Notes. 2.
  • Downer, A. (1986). Proteas have diseases too. Landscape Notes. 2.
  • Downer, A. (1986). Spray nozzles and disease control. Landscape Notes. 2.
  • Downer, A. (1986). Staking causes tree failures? Landscape Notes. 2.
  • Downer, A. (1986). Turfgrass water use. Landscape Notes. 2.
  • Downer, A. (1986). What's killing Modesto Ash Trees. Landscape Notes. 2.
  • Downer, A. (1985). Insect control in the landscape. Landscape Notes. 1.
  • Downer, A. (1985). Landscape Trees. Landscape Notes. 1.
  • Downer, A. (1985). "Short refresher course in pruning -- a synopsis." Tree Trimmers Log 32
  • Armentrout, V.; Downer, A. (1984). "Development of infection cushions of Rhizoctonia solani on artificial surfaces." Phytopathology 74: 817.
  • Downer, A.; Armentrout, V. (1983). "The effect of host exudates on infection cushion morphogenesis of Rhizoctonia solani." Phytopathology 73: 958.

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