Dr A. James Downer

Acting County Director/Farm Advisor

Cooperative Extension Ventura County
669 County Square Drive, #100
Ventura, CA 93003-5401
(805) 645-1458
ajdowner@ucanr.edu

Website

http://ceventura.ucdavis.edu

Specialty

Pathology of landscape ornamentals , Phytophthora Root Rot, Mulches, Potting soils, Palm horticulture, Arboriculture, Master Gardener Advisor.

Education

Ph.D. Plant Pathology, UC Riverside. 1998

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

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

Bibliography

Peer Reviewed

Khiari, L., S. Neila, et al. (2012) Control of Fusarium wilt of tomato caused by Fusarium oxysporum. Applied and Env. Soil Sci
Mayorquin, J.S., A. Eskalen, et al. (2012). "First report of multiple species of the botryosphaeriaceae causing bot canker disease of Indian laurel leaf fig in California." Plant Disease 96(3): 459-459.
Corkidi, L., D. Merhaut, et al. (2011). "Effects of Mycorrhizal colonization on nitrogen and phosphorus leaching from nursery containers." HortScience 46: 1472-1479.
Pittenger, D.R., A.J. Downer, et al. (2009). "Estimating water needs of landscape palms in Mediterranean climates." Hort Technology 19: 700-704.
Downer, A.J., J.Y. Uchida, et al. (2009). "Lethal palm diseases common in the United States." Hort Technology 19: 710-716.
Hodel, D.R., A.J. Downer, et al. (2009). "Pruning Landscape Palms." Hort Technology 19: 695-699.
Hodel, D.R., A.J. Downer, et al. (2009). "Transplanting Palms." Hort Technology 19: 686-689.
Downer, A.J., D. Crohn, et al. (2008). "Survival of plant pathogens in static piles of ground green waste." Phytopathology 98: 574-554.
Faber, B., A.J. Downer, et al. (2007). "Accuracy varies for commercially-available soil test kits analyzing nitrate nitrogen, phosphorus, potassium and pH." Hort Technology 17: 358-362.
Crohn, D.M., B. Faber, et al. (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.R., A.J. Downer, et al. (2006). "Effect of leaf removal and tie-up on transplanted large Mexican fan palms (Washingtonia robusta." Palms 50: 76-81.
Koike, S.T., O. Daugovish, et al. (2006). "Sclerotinia stem and crown rot of celery, caused by Sclerotinia minor." Plant Disease 90: 829.
Hodel, D.R., A.J. Downer, et al. (2006). "The effect of amended backfill soils when planting five species of palms." Hort Technology 16: 457-460.
Daugovish, O., A.J. Downer, et al. (2006). "Weed survival in yardwaste mulch." Weed Technology 21: 59-65.
Downer, A.J. and B. Faber (2005). "Effect of Eucalyptus cladocalyx." J. Applied Hort 7: 90-94.
Corkidi, L., E.B. Allen, et al. (2005). "Effectiveness of four commercial mycorrhizal inoculants on the growth of Liquidambar styraciflua." J. Env. Hort 23: 72-76.
Dahlsten, D.L., K.M. Dane, et al. (2005). "Imported parasitoid helps control red gum lerp psyllid." California Agriculture 59: 229-234.
Hodel, D.R., D. Pittenger, et al. (2005). "Palm root regeneration and implications for transplanting." J. Arboriculture 31: 171-181.
Pittenger, D.R., D. Hodel, et al. (2005). "Transplanting specimen palms: a review of common practices and research-based information." Hort Technology 15: 128-132.
Corkidi, L., E.B. Allen, et al. (2004). "Assessing the infectivity of commercial mycorrhizal inoculants in plant nursery conditions." J. Environmental Horticulture 22: 149-154.
Daugovish, O., A.J. Downer, et al. (2004). "Mustard-derived biofumigation for vegetable crops and strawberries." Agroindustria 3: 5-8.
Valenzuela-Solano, C., D. Crohn, et al. (2004). "Nitrogen mineralization from eucalyptus yard waste mulch applied to young avocado trees." Biol. and Fert. Soils 41: 38-45.
Hodel, D.R., D.R. Pittenger, et al. (2003). "Effect of Leaf removal and tie up on juvenile transplanted canary island date palms (Phoenix canariensis." Palms 47: 177-184.
Downer, A.J., A. Craigmill, et al. (2003). "Toxic potential of oleander derived compost and vegetables grown with oleander soil amendments." J. Human and Vet. Toxicol 45: 219-221.
Downer, A.J., B.A. Faber, et al. (2002). "Factors affecting root rot control in mulched avocado orchards." Hort Technology 12: 601-605.
Dagit, R. and A.J. Downer (2002). To prune or not to prune: recovery of Coast Live Oak after transplanting. Proceedings of the 5th Oak Symposium, San Diego, CA,
Downer, A.J., J.A. Menge, et al. (2001). "Association of cellulytic enzyme activities in eucalyptus mulches with biological control of Phytophthora cinnamomi." Phytopathology 91: 847-855.
Faber, B.A., A.J. Downer, et al. (2001). "Differential effects of mulch on citrus and avocado." Acta Horticulturae 557: 303-307.
Downer, A.J., J.A. Menge, et al. (2001). "Effects of cellulytic enzymes on Phytophthora cinnamomi." Phytopathology 91: 839-846.
Downer, A.J. and D. Hodel (2001). "The effect of mulching and turfgrass on growth and establishment of Syagrus romanzoffiana." Scientia Horticulturae 87: 85-92.
Dagit, R. and A.J. Downer (1999). "Transplanted coast live oaks (Quercus agrifolia." Journal of the International Oak Society 9: 145-150.
Downer, A.J. (1998). The effects of mulch on Phytophthora cinnamomi and Avocado Root Rot. Ph.D. dissertation. University of California, Riverside, CA.: 212.
Tietje, William D., Norman H. Pillsbury, et al. (1997). Status of transplanted coast live oaks in Southern California. Proceedings of the Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues, San Luis Obispo, CA, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
Dagit, R. and A.J. Downer (1996). Status of transplanted coast live oaks in Southern California. Proceedings of the Symposium on Oak Woodlands: Ecology, Management and Urban Interface Issues, San Luis Obispo, CA, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture.
Cudney, D.W., A.J. Downer, et al. (1995). "A non-disruptive technique for kikuyugrass control in cool season turf." California Agriculture 48: 24-28.
McGiffen, M.E. Jr., R.L. Greene, et al. (1995). "Field tests of methanol as a crop yield enhancer." HortScience 30: 1225-1228.
Faber, B., A.J. Downer, et al. (1993). "Inexpensive, hand-held moisture meters." HortTechnology 3: 195-196.
Cudney, D.W., A.J. Downer, et al. (1993). "Kikuyugrass (Pennisetum clandestinum." Weed Technology 7: 180-184.
Bellows, T.S., T.D. Paine, et al. (1992). "Biological control of ash whitefly: a success in progress." California Agriculture 46: 27-28.
Downer, A.J., C.S. Koehler, et al. (1991). "Biology and management of the eugenia psyllid (Trioza eugeniae." Journal of Environmental Horticulture 9(3): 137-141.
Downer, A.J. and W. Cudney (1989). "Glyphosate doesn't harm tall fescue." California Agriculture 43: 13-14.
Armentrout, V.N., A.J. Downer, et al. (1987). "Factors affecting infection cushion development by Rhizoctonia solani." Phytopathology 77: 623-630.
Downer, A.J., C.S. Koehler, et al. (1987). "New psyllid pest of California pepper tree." California Agriculture 42: 30-32.
Armentrout, V.N., A.J. Downer, et al. (1986). "A simplified branching assay for Rhizoctonia solani." Mycologia 78: 657-663.

Non-Peer Reviewed

Downer, A.J. (2013). "Ventura County Master Gardeners support agriculture." Farm Bureau of Ventura County 65(1): 4.
Downer, A.J. (2012). "10 Tips for Healthy Trees." Southwest Trees and Turf 19: 1, 10.
Downer, A.J. (2012). "Botany for arborists VIIâ??Roots: their anatomy and formation." Western Arborist 38(1): 56-58.
Downer, A.J., J.F. Karlik, et al. (2012). Effect of Pruning severity on flowering of landscape roses.
Hodel, D.R., A.J. Downer, et al. (2012). Effect of Sand Backfill When Transplanting Palms. Final Report to California Landscape Contractors Association. Sacramento, CA,
Mayorquin, J.S., A.J. Downer, et al. (2012). "Ficus branch canker of Indian laurel-leaf fig." Western Arborist 38(1): 60-61.
Downer, A.J. (2012). "Landscape trees are threatened by new diseases." Farm Bureau of Ventura County 64(4): 2.
Downer, A.J., D.R. Hodel, et al. (2012). "Susceptibility of landscape palms to Fusarium oxysporum f.sp. canariensis under nitrate and ammoniacal fertilization." HortScience 47(9): S84.
Mochizuki, M., D.R. Hodel, et al. (2012). "The effect of container type on the nursery growth of kentia palms and king palms." HortScience 47(9): S83.
Hodel, D.R., A.J. Downer, et al. (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.R., M. Mochizuki, et al. (2012). "The effect of sand backfill on transplanted palms." HortScience 47(9): S83.
Downer, A.J. (2012). "Trees vs. Turfâ??Los/Lose?" Southwest Trees and Turf 19(5): 1, 10.
Downer, A.J. (2012). "Why Trees Die." Western Arborist 38(1): 28-34.
Downer, A.J. (2011). "Botany for arborists Part V: (secondary xylem)." Western Arborist 37(3): 42-45.
Downer, A.J. (2011). "Botany for arborists VI: Phloem, secondary phloem and bark." Western Arborist 37(4): 48-52.
Hodel, D.R. and A.J. Downer (2011). "Landscape tree diseases: Part 2: Anthracnose disease on Chinese elm." Western Arborist 37(4): 58-60.
Downer, A.J. (2011). Mulches benefit Ventura County agriculture. Farm Bureau of Ventura County Newsletter. 63: 2, 4.
Downer, A.J. (2011). "Snake oil, horticultural myths, horticultural urban legends and persuaders in our industry." Topics in Subtropics 9: 4-8.
Downer, A.J., D.R. Hodel, et al. (2010). "A comparison of â??air root pruningâ?? and conventional plastic container for cultivation of two palm species." HortScience 45(8): S106.
Downer, A.J. (2010). Biology and control of Armillaria mellea. Procs. of the Landscape Disease Symposium, Camarillo, CA,
Downer, A.J. (2010). "Botany for arborists: Part 1." Western Arborist 36(2): 54-55.
Downer, A.J. (2010). "Botany for arborists: Part II." Western Arborist 36(3): 60-61.
Downer, A.J. (2010). "Botany for arborists: Part III." Western Arborist 36(4): 16-18.
Downer, A.J. (2010). "Botany for arborists: Part IV: Plant anatomy." Western Arborist 37(1): 62-64.
Downer, A.J. (2010). "Control of root rot in the landscape with mulches." CAPCA Adviser 13(6): 32-34.
Downer, A.J. (2010). "Diagnosing Landscape Diseases." CAPCA Adviser 13(4): 28-30.
Downer, A.J. (2010). "Drought Survival Tips, Part II." Southwest Trees and Turf 17: 1.
Downer, A.J., D.R. Hodel, et al. (2010). "Effect of deep planting on landscape shrubs." HortScience 45(8): S129.
Hodel, D.R., A.J. Downer, et al. (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.R., A.J. Downer, et al. (2010). "Effect of sand backfill on transplanted palms." Procs. HortScience 45(8): S92.
Downer, A.J., B. Faber, et al. (2010). "Effect of soil disturbance, organic matter and Trichoderma." HortScience 45(8): S113.
Downer, A.J. (2010). "Organic amendments and sulfur can lower soil pH levels." Farm Bureau of Ventura County 62: 2.
Mochizuki, M., A.J. Downer, et al. (2010). "Organic amendments and sulfur in combination reduce soil pH." HortScience 45(8): S91.
Downer, A.J. and R. Greene (2010). "Soil pH reduction Affect of above and below grade planting on four landscape trees in Southern Californiasulfur, amendments, and a cover crop." HortScience 45(8): S129.
Corkidi, L., D.J Merhaut, et al. (2010). "Use of mycorrhizal colonization to reduce nitrogen and phosphorus leaching from nursery containers." Procs. HortScience 45(8): S88.
Downer, A.J. (2010). "What do you know?" Southwest Trees and Turf 17: 1, 10.
Downer, A.J. (2009). "Drought Survival Tips." Southwest Trees and Turf 16: 1, 10.
Hodel, D.R., A.J. Downer, et al. (2009). Effect of sand backfill on transplanted palms. Report to E. J. Slosson Endowment for Ornamental Horticulture. University of California, Agriculture and Natural Resources.
Downer, A.J. (2009). Effects of mulches on Trees. Proceedings of the Plant and Soil Conference, Fresno, Ca,
Downer, A.J. (2009). "Mulch effects on trees." Western Arborist 35: 30-34.
Downer, A.J. (2009). Oaks can thrive with little care. Farm Bureau of Ventura County Newsletter. 59: 4, 6.
Downer, A.J. (2009). "Satisfy treesâ?? needs to succeed." Southwest Trees and Turf 16: 1, 14-15.
Downer, A.J. (2009). "Snake oil horticultural myths, horticultural urban legends, and persuaders in our industry." Applicator News 24: 4-5.
Downer, A.J. and B. Faber (2009). Soil Acidification with Organic Amendments and Sulfur. Final Report to the U.C. Hansen Trust.
Hodel, D.R., A.J. Downer, et al. (2009). "Sooty canker a devastating disease of Indian Laurel-leaf fig trees." Western Arborist 35(4): 28-33.
Corkidi, L., D.J Merhaut, et al. (2009). Use of mycorrhizal fungi to increase nutrient use efficiency and reduce nitrogen and phosphorus leaching in nursery conditions. Procs. of the annual meeting of the International Plant Propagators, Soc. San Diego, CA,
Downer, A.J. (2009). "Whatâ??s wrong with Pygmy Date Palms?" Southwest Trees and Turf 16: 1, 8.
Downer, A.J. (2008). "Controlling landscape diseases." Southwest Trees and Turf 15: 1, 14.
Pittenger, D.R., A.J. Downer, et al. (2008). "Estimating water needs of landscape palms." HortScience 43: 1060-1061.
Downer, A.J. (2008). "Extension supports ornamental production." Farm Bureau of Ventura County 60(10): 2-4.
Downer, A.J. (2008). Lepidoptera pests of landscapes. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Downer, A.J., D.R. Hodel, et al. (2008). "Pruning palms." HortScience 43: 1060.
Downer, A.J., B. Faber, et al. (2008). "Soil pH reduction with sulfur, amendments, and a cover crop." HortScience 43: 1234.
Hodel, D.R., A.J. Downer, et al. (2008). "Transplanting and planting palms." HortScience 43: 1060.
Downer, A.J. (2008). "Unraveling the web of soil microbiology." Arborist News 17: 12-16.
Faber, B. and A.J. Downer (2007). "Are all phosphorous products the same?" Topics in Subtropics 5: 3-4.
Downer, A.J. (2007). "Diagnosing your oak tree: Part I, Diseases." Western Arborist 33: 34-40.
Downer, A.J., D.R. Hodel, et al. (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.A. and A.J. Downer (2007). Evaluation of commercially available phosphonate products for control of Phytophthora cinnamomi. Procs. of the 11th World Avocado Congress, Santiago, Chile,
Downer, A.J. (2007). "Fusarium wilt pathogen of Phoenix canariensis." Western Arborist 33: 15.
Downer, A.J. (2007). Gardens are constantly changing. Ventura County Star Newspaper.
Downer, A.J. (2007). "Go out and diagnose those diseases." Southwest Trees and Turf 14: 1, 14.
Downer, A.J. and D.R. Hodel (2007). "Leaf removal from Washingtonia filifera does not prevent infection by Phaeochoropsis neowashingtoniae." HortScience 42: 978.
Daugovish, O., A.J. Downer, et al. (2007). "Mustard derived biofumigation for lettuce in coastal California." HortScience 42: 953.
Downer, A.J. (2007). "New thrips pest attacks Myoporum." Western Arborist 33: 24.
Downer, A.J. (2007). Palm Diseases. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Downer, A.J. (2007). "Palm trunk decays are definitely in California." Western Arborist 33: 15.
Downer, A.J. (2007). Plant Health: A pathologistâ??s understanding. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Downer, A.J. (2007). "Planting; not a deep subject." Southwest Trees and Turf 14: 1, 14-15.
Downer, A.J., D.R. Hodel, et al. (2007). "Poor postharvest handling and storage of transplanted Washingtonia robusta." HortScience 42: 978-979.
Hodel, D.R., A.J. Downer, et al. (2007). "Recent palm horticultural research at the University of California." The Palm Journal 187(39-44)
Downer, A.J. (2007). "Snake oil, horticultural myths, horticultural urban legends, and persuaders in our industry." Arborist News 16: 30-34.
Faber, B. and A.J. Downer (2007). "Soil test kits." Western Arborist 33: 55.
Downer, A.J. (2007). Use mulches now to save water and prevent weeds. Ventura County Star Newspaper.
Daugovish, O. and A.J. Downer (2007). "Using palm trunk fibers as peatmoss replacements for container media." HortScience 42: 877.
Downer, A.J. (2006). Abiotic diseases and disorders of landscape plants. Proceedings of the Landscape Disease Symposium, Oak View, CA,
Faber, B. and A.J. Downer (2006). "Mulches in avocado." UC Delivers Story
Daugovish, O., A.J. Downer, et al. (2006). Mustard-derived biofumigation for lettuce in Coastal California. Proc. 2^nd Int. Biofumigation Symp, Moscow, Idaho,
Downer, A.J. (2006). "Palms and palm disorders." Western Arborist 32(4): 24-25.
Downer, A.J. (2006). "Palms puzzle pathologists." Southwest Trees and Turf 13: 1, 14.
Downer, A.J. (2006). "Snake oil in horticulture." Western Arborist 32(3): 14-17.
Downer, A.J. (2006). "Where oaks grow." Western Arborist 32: 14-17.
Hodel, D.R. and A.J. Downer (2005). A presentation of research findings from the University of California, Cooperative Extension. Proceedings of the palm research symposium, The Huntington Botanical Gardens, San Marino, UC Cooperative Extension, Los Angeles and Ventura.
Downer, A.J. (2005). An introduction to the Fungiâ??Who they are, how they grow and why they make such good plant pathogens. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Downer, A.J. (2005). "Education: A valuable commodity." Southwest Trees and Turf 12: 1, 14.
Downer, A.J. (2005). "Pruning Oaks." Western Arborist 31: 46-50.
Downer, A.J. (2005). "Some factors you need to know to understand the biology of the oak tree in California." Western Arborist 31: 34-37.
Downer, A.J. (2004). "Blow wind blow." Southwest Trees and Turf 10: 6.
Downer, A.J. (2004). "Disease notes: Armillaria root rot." Western Arborist 30: 24-27.
Corkidi, L., E.B. Allen, et al. (2004). "The use of mycorrhizal inoculants in the ornamental nursery industry." Cohort 6: 6-10.
Downer, A.J. (2004). "Whatâ??s up with the redwoods?" Western Arborist 30: 10-11.
Dahlsten, D.L., D.L. Rowney, et al. (2003). Biological control of introduced psyllids on eucalyptus. Proc. of the International Conf. on Biological Control USDA Forest Service, Publication FHTET â?? 03 â?? 05.
Downer, A.J. (2003). Diseases of Palm Trees: Some new some old. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Faber, B.A., A.J. Downer, et al. (2003). Effects of mulch on avocado and citrus. Procs. 5th World Avocado Cong, Malaga, Spain,
Downer, A.J. and B. Faber (2003). "Effects of mulches on trees." Southwest Trees and Turf 8: 1, 14.
Daugovish, O., A.J. Downer, et al. (2003). Exploring biofumigational potential of mustards. Procs. of the annual international research conference on methyl bromide alternative and emissions reductions, San Diego, CA,
Daugovish, O., A.J. Downer, et al. (2003). Exploring biofumigational potential of mustards. Procs. 2003 Annual International Research Conference on Methyl Bromide Alternatives and Emissions Reductions, San Diego, CA,
Downer, A.J. (2003). "Observations of Fusarium wilt on palms." Pacific Coast Nurseryman 62: 66-67.
Downer, A.J. (2003). "Palm disease notes, continued: pink rot." Pacific Coast Nurseryman 63: 66-67.
Downer, A.J. (2003). "Powdery mildew on oakâ??Itâ??s everywhere." Western Arborist 29: 53.
Hodel, D.R., D.R. Pittenger, et al. (2003). Root system regeneration and resprouting in palms (Arecaceae). Monocots III: The Third International Conference on the Comparative Biology of the Monocotyldedons.
Becker, J.L., X. Chen, et al. (2003). Root-knot nematode-destroying microorganisms for home garden and landscape us. Reports of the Elvenia J. Slosson Endowment.: 11.
Downer, A.J. (2003). Snake oil: horticultural myths, urban horticulture legends, frauds, and carpetbaggers in our industry. Procs. of the Landscape Disease Symposium, Santa Paula, CA,
Pittenger, D., D.R. Hodel, et al. (2003). "Transplanting specimen palms: common practices and research-based information." HortScience 38: 836.
Downer, A.J. (2002). "Planting depthâ??A common and serious cause of tree deaths." Western Arborist 28: 8-9.
Becker, J.L., P. Han, et al. (2002). Root knot nematode destroying microorganisms for home garden and landscape use. Reports of the Elvenia J. Slosson Endowment.: 8.
Downer, A.J. (2002). Survival of fungal pathogens in static yardwaste piles. Procs. of the Landscape Disease Symposium, Simi Valley, CA,
Pittenger, D. and A.J. Downer (2002). "The herbicide contaminated compost issue." California Landscaping: 32-34.
Downer, A.J. (2001). Diagnosing and curing diseases in large specimen treesâ??A challenge for the arboricultural consultant. Procs. of the Landscape Disease Symposium,
Downer, A.J. (2001). New diseases of known and unknown cause in California landscapes. Procs. of the Landscape Disease Symposium,
Faber, B., A.J. Downer, et al. (2001). Phytophthora. Gordon Conference. Ventura CA,
Dahlsten, D.L., D.L. Rowney, et al. (2001). Red gum lerp psyllid biological control in California. Procs. Nat. Ent. Soc. Mtg, San Diego, CA,
Downer, A.J., D. Pittenger, et al. (2001). "Root regeneration of landscape palms." HortScience 36: 430.
Downer, A.J. (2000). Death by Compost: response of ornamental plants to toxic organic substrates. Procs. of the Landscape Disease Symposium, Oak View, CA,
Pittenger, D.R., A.J. Downer, et al. (2000). Palm root regeneration and its significance in transplanting. Proceedings of the 11th Conference of the Metropolitan Tree Improvement Alliance, Gresham, OR,
Faber, B., A.J. Downer, et al. (2000). Phytophthora control with mulches. Nelson, New Zealand, ISHS.
Downer, A.J. (2000). Plant Pathogens in organic substrates and disease suppression with mulches. Procs. of the Microbiology of Compost Organic Mulches and Green Materials Seminar, Oak View, CA,
Downer, A.J. (2000). Root rot management in the landscape. Procs. of Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day,
Downer, A.J. (2000). The role of organic materials in soil nutrient status. Procs. of the Microbiology of Compost Organic Mulches and Green Materials Seminar, Oak View, CA,
Downer, A.J. (1999). Calcium based control of Phytophthora root rot. Procs. of the Landscape Disease Symposium,
Menge, J.A., B. Faber, et al. (1999). Compost demonstration project southern California. Use of yard trimmings and compost on citrus and avocado. Integrated Waste Management Board Pub. #443-99-010: 36.
Menge, J.A., B. Faber, et al. (1999). Compost demonstration project southern California: use of yard trimmings and compost on citrus and avocado. Integrated Waste Management Board. Pub. #443-99-010: 36.
Downer, A.J. (1999). How to be a better Diagnostician: Tools, Tips and Techniques of the Trade. Procs. of the Landscape Disease Symposium,
Downer, A.J., J.A. Menge, et al. (1999). "The effect of yard trimmings as a mulch on growth of avocado and avocado root rot caused by Phytophthora cinnamomi." Cal. Avocado Soc. Yrbk 83: 87-104.
Faber, B.A. and A.J. Downer (1999). Weed control problems using greenwaste. Procs. 51st Ann. Weed Sci. Soc. of Amer, Anaheim, CA,
Downer, A.J. (1998). Abiotic diseases/disorders of trees and landscape plants. Procs. of the Landscape Disease Symposium, Oak View, CA,
Downer, A.J. (1998). Amendments and mulches for new landscape plantings. Procs. of Installing New Landscapes â??Doing it right the first time!! Oak View, CA,
Millar, J.G., T.D. Paine, et al. (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 DANR.: 53-56.
Faber, B.A., A.J. Downer, et al. (1998). Mulch effects on avocado root rot. Procs. 3rd World Avocado Congressâ??1995, Haifa, Israel,
Downer, A.J. (1998). "Mulches for landscape use." Hawaii Landscape 25: 16-24.
Downer, A.J. (1998). "Mulching influence of the soil environment." Western Arborist 24: 18.
Nealy, D. and D. Nealy (1998). Palm root regeneration. Proc. Landscape Below Ground II Workshop, San Francisco, Champaign, IL: International Soc. Arboriculture.
Downer, A.J. (1998). "Phytophthora cinnamomi." Western Arborist 25: 27-29.
Downer, A.J. (1998). "The role of soil enzymes in control of P. cinnamomi." Western Arborist 24: 45-46.
Downer, A.J. and A. Craigmill (1998). Toxicity of oleander derived compost. Report of the Elvenia J. Slosson Fund for Ornamental Horticulture 1995-1998. University of California DANR.: 14-16.
Dagit, R. and A.J. Downer (1998). "Transplanting coast live oaks in southern California." Western Arborist 24: 36-40.
Downer, A.J. (1997). "Aleppo blight." Western Arborist 23: 7.
Downer, A.J., J.A. Menge, et al. (1997). "An enzymatic mechanism for biological control of Phytophthora cinnamomi." Phytopathology 87: 25.
Downer, A.J., J.A. Menge, et al. (1997). "An enzymatic mechanism for biological control of Phytophthora cinnamomi." Phytopathology 87: 25.
Downer, A.J. (1997). "Solving the mystery of plant maladies." Southwest Trees and Turf 2: 1, 3.
Keeley, J. (1997). Status of transplanted coast live oaks in southern California. Proceedings of the 2nd Interface Between Ecology and Land Development in California, Occidental College,
Downer, A.J. (1997). The role of soil Enzymes in Control of Phytophthora cinnamomi. Procs of the Landscape Disease Symposium, Oak View, CA,
Faber, B.A. and A.J. Downer (1997). Yardwaste mulches in avocado and citrus orchards. Procs. of the Pacific Division Amer. Assn. Advan,
Downer, A.J. (1996). Abiotic diseases and disorders of landscape plants. Procs of the Landscape Disease Symposium, Oak View, CA,
Breuninger, J.M., D.W. Cudney, et al. (1996). "Kikuyugrass management in turf with turflon ester in California." Down To Earth 51: 1-5.
Faber, B.A., A.J. Downer, et al. (1996). Yardwaste mulches in avocado and citrus orchards. Report of the Elvenia Slosson Fund. DANR.
Downer, A.J. and B. Faber (1995). Determining the usefulness of eucalyptus mulches in landscape plantings. Ann. Report of the Slosson Endowment.: 28-30.
Cowles, R.S. and A.J. Downer (1995). "Eucalyptus snout beetle detected in California." California Agriculture 49: 38, 40.
Hodel, D.R. and A.J. Downer (1994). Effects of mulches on the growth of palms. Procs. of Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day,
Cowles, R.S. and A.J. Downer (1994). "Eucalyptus snout beetle." HortScript 8
McGiffen, M.E., J. Manthey, et al. (1994). Field tests of methanol as a crop yield enhancer. 1994 Western Plant Growth Regulator Symposium.
McGiffen, M.E., J. Manthey, et al. (1994). "Field tests of methanol as a crop yield enhancer." HortScience 29: 459.
Cudney, D.W., A.J. Downer, et al. (1994). Kikuyugrass management in cool and warm season turf. Procs. of Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day,
Cudney, D., A.J. Downer, et al. (1994). "Low-impact management of kikuyugrass in cool-season turf." California Fairways
Downer, A.J. and B.A. Faber (1994). "Organic mulches and amendments for shade trees." Arbor Age 14: 8-10.
Faber, B., A.J. Downer, et al. (1994). "Portable soil meters." American Nurseryman 179: 93-94.
Downer, A.J. (1994). Studies on Yardwaste use in the landscape. Procs. of Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day,
Downer, A.J. and B. Faber (1994). "The effect of eucalyptus mulches on germination of annual and perennial weed species." HortScience 29: 555.
Downer, A.J., M. Shaw, et al. (1994). "The effect of pruning on branch growth in two oak species." HortScience 29: 550.
Downer, A.J. and R.S. Cowles (1994). "The eucalyptus snout beetle: a new threat to eucalyptus in California." Western Arborist 20: 18-19.
Cudney, D.W., A.J. Downer, et al. (1993). "A new, non-disruptive alternative for kikuyugrass management in cool-season turf." California Turfgrass Culture 42: 1-4.
Downer, A.J., D. Pittenger, et al. (1993). Biosolids increase yield and color of perennial ryegrass when added to yardwaste composts. Procs. of Orn. Hort. Cont. Conf, Riverside, CA,
Downer, A.J., B. Faber, et al. (1993). Green waste compost for landscaping--a demonstration project. Proc. 1993 Plant and Soil Conference, Sacramento, Ca,
Cudney, D., A.J. Downer, et al. (1993). Integrated kikuyugrass management in cool season turf. Procs. of Orn. Hort. Cont. Conf, Riverside, CA,
Downer, A.J. (1993). "Mulch matters." The Broadcaster 43: 3-4, 24.
Downer, A.J., D. Pittenger, et al. (1993). "Sewage sludge increases yield and color of perennial ryegrass when added to yardwaste composts." HortScience 28: 541.
Downer, A.J. (1993). Trunk temperatures of California sycamore. Procs. of Orn. Hort. Cont. Conf, Riverside, CA,
Downer, A.J., C.S. Koehler, et al. (1992). Biology and management of eugenia psyllid. Procs. of the 33rd annual entomology conference,
Downer, A.J., B. Faber, et al. (1992). "Composted and fresh eucalyptus chip mulches promote early establishment of California sycamore." HortScience 27: 686.
Downer, A.J., B. Faber, et al. (1992). "Effects of hydrophilic polymers and organic amendments on establishment of Kentucky bluegrass." HortScience 27: 588.
Downer, A.J. (1992). Evaluating soil amendments and polymers for use in the landscape. Procs. of Turfgrass Research Conference and Field Day and the Landscape Research Conference and Field Day,
Shaw, A., A.J. Downer, et al. (1992). Irrigation scheduling of California live oak (Quercus agrifolia). 73rd Ann. Meeting of the Pacific. Div. Amer. Assn. Advn. Sci.: 50.
Downer, A.J., D.W. Cudney, et al. (1992). "Kikuyugrass control in cool season turfgrass." HortScience 27: 676.
Downer, A.J. (1991). Effect of water absorbing polymers and organic soil amendments on performance of cools season turfgrass. Procs. of Turfgrass Research Conference and Field Day, Riverside, CA,
Cudney, D.W., A.J. Downer, et al. (1991). kikuyugrass control studies in southern California. Procs. of Turfgrass Research Conference and Field Day, Riverside, CA,
Downer, A.J. and C. Koehler (1990). Eugenia psyllid. D.A.N.R. publication # 7190
Downer, A.J., J.N. Kabashima, et al. (1990). "Eugenia psyllid update." Pacific Coast Nurseryman 49: 40.
Downer, A.J. (1990). "How to save water in landscapes." The Broadcaster 43: 5, 28-30.
Cudney, W.D., A.J. Downer, et al. (1990). Kikuyugrass control studies. Procs. of Turfgrass Research Conference and Field Day,
Downer, A.J. and H.D. Ohr (1990). "Palms trees have problems too." Grounds Maintenance 24: 94, 100, 102.
Ohr, H.D. and A.J. Downer (1989). "Diseases of palm trees." International Society of Arboriculture - Western Chapter News 15: 42-43.
Ohr, H.D. and A.J. Downer (1989). Diseases of palm trees. 1988 1989 Annual Report Turfgrass and Ornamentals Research.: 26.
Koehler, C.K. and A.J. Downer (1989). "Eugenia psyllid update." Southwest Lawn and landscape 5: 23, 27.
Cudney, D.W., C. Elmore, et al. (1989). Management and control of unwanted species in turf. 1988 1989 Annual Report Turfgrass and Ornamentals Research. Univ. Calif. Riverside.: 38.
Cudney, D.W., C. Elmore, et al. (1989). Management and control of unwanted species in turf. 1988 1989 Annual Report Turfgrass and Ornamentals Research.: 38.
Cudney, D.W., C. Elmore, et al. (1989). Management and control of unwanted species in turf. 1988 1989 Annual Report Turfgrass and Ornamentals Research.: 38.
Downer, A.J. and H.D. Ohr (1989). "Palm trees have problems too." Grounds Maintenance 24: 94-102.
Svihra, P., A.J. Downer, et al. (1989). Peppertree psyllid control. D.A.N.R. publication # 7188
Downer, A.J. and D. Cudney (1989). "Research shows no residue effects from glyphosate." California Landscape 14: 28-29.
Downer, A.J. (1987). Diseases of shade trees. Proceedings of the Turf and Landscape Institute, Anaheim Ca,
Downer, A.J. (1987). "Learn how fungicides work." International Society of Arboriculture - Western Chapter News 13: 15-16.
Downer, A.J. (1986). "Anthracnose on Modesto ash." International Society of Arboriculture - Western Chapter News 18: 8.
Downer, A.J. (1986). "Diagnosing shade tree problems." International Society of Arboriculture - Western Chapter News 12: 17-21.
Downer, A.J. (1986). "Do tree injections work?" Tree Trimmers Log 41
Downer, A.J. (1985). "Short refresher course in pruning a synopsis." Tree Trimmers Log 32
Armentrout, V.N. and A.J. Downer (1984). "Development of infection cushions of Rhizoctonia solani." Phytopathology 74: 817.
Downer, A.J. and V.N. Armentrout (1983). "The effect of host exudates on infection cushion morphogenesis of Rhizoctonia solani." Phytopathology 73: 958.

ANR Publications

ANR Workgroup Associations

Floriculture and Nursery - Member
Landscape - Member
Nematology - Member
Oak Woodland Conservation - Member
Ornamental Horticulture Ext Cont Confr (OHECC) - Member
Pest Management in ANR - Member
Turfgrass - Member
Urban Horticulture - Member

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