Jorn Ole Becker

Distinguished Professor of Cooperative Extension in Nematology & Distinguished Nematologist
Nematology Department
University of California - Riverside
2250 Spieth Hall
Riverside, CA 92521-0415
obecker@ucr.edu Create VCard

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Biography

Biography

Jörn Ole Becker has been a faculty member at UC Riverside's Department of Nematology since 1992. He received his undergraduate and graduate education in Agricultural Sciences at the Christian-Albrecht University, Kiel (Pre-diploma) and the Georg August University, Göttingen (Dipl. Ing. agr.) in Germany. He continued at the GAU for his doctoral degree (Dr. sc. agr.) in Plant Pathology with a minor in Microbiology and Tropical/Subtropical Crop production. His postdoctoral work took him to four continents and various R&D positions in agrochemical and biotechnological industries. In his UCR position, he has focused on basic and mission-oriented research on the biology, ecology, and management of plant-parasitic nematodes. Additionally, he extends information about integrated nematode management to UC advisors, growers, industry representatives, and the general public. He is a fellow of the American Association for the Advancement of Science and the Society of Nematologists.

Former Institutions

Ciba-Geigy Ltd., Basel, Switzerland

Plant Genetic Systems, Ghent, Belgium

Degrees

Dr. sc. agr., Plant Pathology 1982, Georg August University, Göttingen, Germany

Dipl. Ing.,  Agricultural Sciences 1980, Georg August University, Göttingen, Germany

Education

Dr. sc. agr. Plant Pathology, Georg August Universität, Göttingen, Germany. 1982
Dipl. Ing. Agricultural Sciences, Georg August Universität, Göttingen, Germany. 1980

Awards

Discipline

Nematology

Specialty

Integrated pest management of plant-parasitic nematodes

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

Bibliography

Peer Reviewed

  • Ploeg, A.T., Edwards, S., Loffredo, A., and Becker, J.O. 2024. Efficacy of Fluorinated Nematicides for Management of Root-knot Nematodes in California Processing Tomatoes. Journal of Nematology 56:1. Doi:10.2478/jofnem-2024-0034

  • Becker, J.S., Ruegger, P., Borneman, J., and Becker, J.O. 2024. Indigenous populations of a biological control agent in agricultural field soils predicted suppression of a plant pathogen. Phytopathology 114:334-339. Doi:10.1094/PHYTO-07-23-0221-R

  • Ploeg, A., Witte, H., Subbotin, S., Tandingan De Ley, I., Smith Becker, J., and Becker, J.O. 2024. Meloidogyne marylandiis involved in, but not the primary cause of creeping bentgrass decline of putting greens in Southern California. Journal of Nematology 56:1. Doi:10.2478/jofnem-2024-0046.

  • Loffredo, A., Edwards, S., Ploeg, A., and Becker, J.O. 2024. Performance of biological and chemical nematicides in different soils to control Meloidogyne incognita in tomato plants. Journal of Phytopathology 172, e13250. Doi:10.1111/jph.13250

  • Ruiz, M., Du Vo, A., Becker, J.O., and Roose, M.L. 2023. Real-Time PCR to Screen for Phenotype Resistance to the Citrus Nematode Tylenchulus semipenetrans Cobb. Plants 12(13), 2543. Doi:10.3390/plants12132543

  • Faske, T.R., Mueller, J.D., Becker, J.O., Bernard, E., Bradley, C.A., Bond, J.P., Desaeger, J., Eisenback, J.D., Grabau, Z.J., Hu, J., and Kemerait, R.C. 2023. Summarized distribution of the southern root-knot nematode, Meloidogyne incognita, in field crops in the United States. Plant Health Progress 24.

  • Orlinski, P.M., Petelewicz, P., Schiavon, M., Mundo-Ocampo, M., Becker, J.O., Baird, J.H. 2022. Pacific shoot-gall disease control in annual bluegrass putting greens using a new formulation of abamectin. International Turfgrass Society Research Journal 14:883–892. Doi:10.1002/its2.53

  • Becker, J.O. 2021. Mitigating a galling problem in California's carrot production. Chapter 39. In: Integrated nematode management: State of the art and visions for the future. Eds. Richard Sikora, Johan Desaeger, and Leendert Molendijk, CABI. Pp 284-289. Doi:10.1079/9781789247541.0039.

  • Chen, Y.-Y., Koike, S.T., Logan, G.D., Drozd, C., De Oliveira Silva, J., Smith Becker, J., Loffredo, A., Wu, H., Ruegger, P.M., Becker, J.O., and Borneman, J. 2020. Detection of nematophagous fungi from Heterodera schachtii females using a baiting experiment with soils cropped to Brassica species from California’s central coast. PhytoFrontiers 1:4–12. DOI:10.1094/PHYTOFR-07-20-0009-R. 

  • Smith Becker, J., J. Borneman, and J.O. Becker 2020. Effect of Heterodera schachtii female age on susceptibility to three fungal hyperparasites in the genus Hyalorbilia. Journal of Nematology 52:1–12. DOI: 10.21307/jofnem-2020-093

  • Wu, H.Y., De Oliveira Silva, J., Smith Becker, J., and Becker, J.O. 2020. Fluazaindolizine mitigates plant-parasitic nematode activity at sublethal dosages. Journal of Pest Science 94:573–583. Doi:10.1007/s10340-020-01262-2.

  • Petelewicz, Pawel, Orlinski, Pawel M., Schiavon, Marco, Mundo-Ocampo, Manuel, Becker, J. Ole, and Baird, James H. 2020. Fluopyram controls shoot-galling caused by Anguina pacificae and improves turf quality in annual bluegrass putting greens. HortTechnology 30:709–718. DOI:10.21273/HORTTECH04680-20.

  • Witte, H., Jiue-in Yang, J.-I., Logan, G.D., Colindres, N.B., Peacock, B.B., Smith Becker, J., Ruegger, P.M., Becker, J.O., and Borneman, J. 2020. Hyalorbilia oviparasitica clade detected in field soils cropped to sugar beets and enriched in the presence of Heterodera schachtii and a host crop. PhytoFrontiers 1:13–20. DOI:10.1094/PHYTOFR-07-20-0005-R.

  • Liang, Y.-J., Ariyawansa, H.A., Becker, J.O., and Yang, J.-I. 2020. The evaluation of egg-parasitic fungi Paraboeremia taiwanensis and Samsoniella sp. for the biological control of Meloidogyne enterolobii on Chinese cabbage. Microorganisms 8 (6):828  Doi:10.3390/microorganisms8060828.

  • Moriyama, Y., H. Yamaura, R. Fukui, and J.O. Becker 2020. The role of phosphorus in growing tomatoes in near water-saturated soil. Journal of Plant Nutrition 43:1091–1103. doi:10.1080/01904167.2020.1724302. 

  • Ploeg, A., S. Stoddard, and J.O. Becker 2019. Control of Meloidogyne incognita in sweetpotato with fluensulfone. Journal of Nematology 51:1–8. Doi:10.21307/jofnem-2019-018 

  • Silva, Juliana de Oliveira, Angelo Loffredo, Mara Rúbia da Rocha, and J. Ole Becker 2019. Efficacy of new nematicides for managing Meloidogyne incognita in tomato crop. Journal of Phytopathology 167:295-298. Doi:10.1111/jph.12798

  • Becker, J.O., A. Ploeg, and J.J. Nuñez 2019. Multi-year field evaluation of fluorinated nematicides against Meloidogyne incognita in carrots. Plant Disease 103:2392–2396. Doi:10.1094/PDIS-03-19-0489-RE

  • Koch, E., J.O. Becker, G. Berg, R. Hauschild, J. Jehle, J. Köhl, K. Smalla 2018. Biocontrol of plant diseases is not an unsafe technology! Journal of Plant Diseases and Protection 125(2):121–125. Doi:10.1007/s41348-018-0158-4

  • Moriyama, Y., H. Yamaura, J.O. Becker, and R. Fukui 2018. Soil biological and physiochemical factors limiting the growth potential of tomato planted in waterlogged volcanic soil. Journal of Plant Nutrition 41:2151-2169. Doi:10.1080/01904167.2018.1482914

  • Becker, J.O., A. Ploeg, and J. Nunez 2017. Novel nematicides for root-knot nematode management in fresh market carrot production, 2016. Plant Management Disease Reports, Vol. 11: N026.

  • Ploeg, A.T., J.O. Becker, and S. Stoddard 2017. Novel nematicides to manage root-knot nematodes in California sweetpotato, 2016. Plant Management Disease Reports, Vol.11:N027.

  • Mundo-Ocampo, M., J.G. Baldwin, T.J. Pereira, J.R. Camacho-Baez, A.D. Armenta-Bojorquez, M. Camacho-Haro, and J.O. Becker 2017. Occurrence of Belonolaimus in Sinaloa, Northwestern Mexico: A New Report on Distribution and Host Range. Journal of Nematology 49(1):103–113.

  • Portillo, J.F.S., G.A.L. García, M. Mundo Ocampo, Á.R. Olivas, I. De Ley Tandingan, and J.O. Becker 2016. Búsqueda y aislamiento de hongos nematófagos vs Meloidogyne spp. en el norte de Sinaloa, México. [Search and isolation of nematophagous fungi vs Meloidogyne spp. in northern Sinaloa, Mexico] Revista Mexicana de Ciencias Agrícolas 7:1829–1839. http://www.redalyc.org/html/2631/263149505004/

  • Becker, J.O. 2015. Cilantro/Parsley: Nematodes. Pp. 26-27. In: UC IPM Pest Management Guidelines Cilantro and Parsley. Eds. Smith, R., Joseph, S.V., Becker, J.O., Koike, S.T., Dara, S.K., Daugovish, O., Davis, R.M., and Natwick, E.T. Revised continuously. UC ANR Publication 3476. Oakland, CA. http://ipm.ucanr.edu/PDF/PMG/pmgcilantroparsley.pdf

  • Becker, J.O. 2014. Citrus Pest Management: Nematodes. In: UC Citrus Production Manual, eds. L. Ferguson, E. E. Grafton-Cardwell., UC ANR 3539 pp. 303-306.

  • Mathews, D.M., J.O. Becker, and S. Tjosvold 2014. Plant Diseases. Chapter 13. In Newman, J. (ed) Container Nursery Production and Business Management Manual. UC ANR Publication 3540. Richmond, CA. pp. 178-200.

  • Becker J.O. 2014. Plant Health Management: Crop Protection with Nematicides. In: Neal Van Alfen, editor-in-chief. Encyclopedia of Agriculture and Food Systems, Vol. 4, San Diego: Elsevier, pp. 400-407. Doi:10.1016/B978-0-444-52512-3.00180-7.

  • Smith Becker, J., J. Borneman, and J.O. Becker 2013. Dactylella oviparasitica parasitism of the sugar beet cyst nematode observed in trixenic culture plates. Biological Control 64:51–56. Doi:10.1016/j.biocontrol.2012.10.007

  • Luo, L., S.R. Yates, D.J. Ashworth, R. Xuan and J.O. Becker 2013. Effect of films on 1,3-dichloropropene and chloropicrin emission, soil concentration, and root-knot nematode control in a raised bed. Journal of Agricultural and Food Chemistry 61:2400–2406. Doi:10.1021/jf3034368.

  • Becker, J.O., A. Ploeg, and J. Nunez 2013. Efficacy of nematicides for root-knot nematode management in tomato, 2012. Plant Disease Management Report No. 7:N009.

  • Matsui, M., H. Honjo, J.O. Becker, and R. Fukui 2013. Temperature-dependent effects of soil amendment with crop residues on suppression of Rhizoctonia damping-off of sugar beet. Plant and Soil 348:467–477. DOI:10.1007/s11104-012-1427-9.

  • Yang, J., A. Loffredo, J. Borneman, and J.O. Becker 2012. Biocontrol efficacy among strains of Pochonia chlamydosporia obtained from a root-knot nematode suppressive soil. Journal of Nematology 44:67–71.

  • Yang, J., P.M. Ruegger, M.V. McKenry, J.O. Becker and J. Borneman 2012. Correlations between root-associated microorganisms and peach replant disease symptoms in a California soil. PLoS ONE 7(10): e46420. Doi:10.1371/journal.pone.0046420

  • Becker, J.O., A. Ploeg, and J. Nunez 2012. Evaluation of novel products for root knot nematode management in tomato, 2011. Plant Disease Management Report No. 6:N016.

  • Becker, J.O. 2012. Nematodes. In: Integrated Pest Management for Citrus. 3rd edition, ANR Publication 3303. Pp 201-207.

  • Yang, J., S. Benecke, D.R. Jeske, F. Rocha, J. Smith-Becker, P. Timper, J.O. Becker, and J. Borneman  2012. Population dynamics of Dactylella oviparasitica and Heterodera schachtii: toward a decision model for sugar beet planting. Journal of Nematology 44:237–244.

  • Watanabe, K., M. Matsui, H. Honjo, J.O. Becker, and R. Fukui 2011. Effects of soil pH on Rhizoctonia damping-off of sugar beet and disease suppression induced by soil amendment with crop residues. Plant and Soil 347:255–268. Doi:10.1007/s11104-011-0843-6

  • Westphal, A., A. Pyrowolakis, R.A. Sikora, and J.O. Becker 2011. Soil suppressiveness against Heterodera schachtii in California cropping areas. Nematropica 41:161–171.

  • Bent, E., A. Loffredo, J. Yang, M.V. McKenry, J.O. Becker, and J. Borneman 2009. Investigations into peach seedling stunting caused by a replant soil. FEMS Microbiology Ecology 68:192–200. Doi:10.1111/j.1574-6941.2009.00668.x

  • Gao, X., B. Yin, J. Borneman, and J.O. Becker 2008. Assessment of parasitic activity of Fusarium strains obtained from a Heterodera schachtii-suppressive soil. Journal of Nematology 40(1):1–6.

  • Bent, E., A. Loffredo, J. Yang, M.V. McKenry, J.O. Becker, and J. Borneman 2008. Detection and investigation of soil biological activity against Meloidogyne incognita. Journal of Nematology 40(2):109–118.

  • Westerdahl, B.B. and J.O. Becker 2008. Nematodes. Pp. 27-28. UC IPM Pest Management Guideline: Onion/Garlic, UC ANR Publication 3453. http://www.ipm.ucdavis.edu/PMG/r584200111.html

  • Downer, A. J., D. Crohn, B. Faber, O. Daugovish, J.O. Becker, J.A. Menge,  and M.J. Mochizuki 2008. Survival of plant pathogens in static piles of ground green waste. Phytopathology 98:547–554. Doi:10.1094/PHYTO-98-5-0547

  • Karlik, J.F., J.O. Becker, C.H. Haas, and U.K. Schuch 2007. Delivery of gases via drip irrigation tubing: An exploratory study. Acta Horticulturae 751:69-76.

  • Borneman J, J.O. Becker, E. Bent, B. Lanoil, B.B. McSpadden Gardener, R. Olatinwo, L. Presley, A.J. Scupham, L. Valinsky, and B. Yin 2007. Identifying microorganisms involved in specific in situ functions: experimental design considerations for rRNA gene-based population studies and sequence-selective PCR assays, Page 748-757 in Christon J. Hurst (ed.) Manual for Environmental Microbiology (3rd ed). ASM Press, Washington D.C. Doi:10.1128/9781555815882.CH61.

  • Borneman, J., and J.O. Becker 2007. Identifying Microorganisms Involved in Specific Pathogen Suppression in Soil. Annual Review of Phytopathology 45:153-72. Doi:10.1146/annurev.phyto.45.062806.094354.

  • Becker, J.O., U.K. Schuch, and J.F. Karlik 2007. Roses and emotive appeal: “If Zeus chose us a king of the flowers…” Acta Horticulturae 751:357-366.

  • Olatinwo, R., B. Yin, J.O. Becker, and J. Borneman 2006. Suppression of the plant-parasitic nematode Heterodera schachtii by the fungus Dactylella oviparasitica. Phytopathology 96:111-114. Doi:10.1094/PHYTO-96-0111

  • Becker, J.O., Becker, J.S., Morton, H.V. and Hofer, D. 2006.  Early protection against root-knot nematodes through nematicidal seed coating provides season-long benefits for cucumbers. Pages 395-402 in Proceedings of Cucurbitaceae 2006. G.J. Holmes, ed. Universal Press, Raleigh, North Carolina. 602 pp.

  • Olatinwo, R., J. Borneman, and J.O. Becker 2006. Induction of beet-cyst nematode suppressiveness by the fungi Dactylella oviparasitica and Fusarium oxysporum in field microplots. Phytopathology 96:855-859. Doi:10.1094/PHYTO-96-0855

  • Olatinwo, R., J.O. Becker, and J. Borneman 2006. Suppression of Heterodera schachtii populations by Dactylella oviparasitica in four soils. Journal of Nematology 38:345-48.

  • Westerdahl, B.B., A.T. Ploeg, and J.O. Becker 2005. Celery: Nematodes. In: UC ANR Publication 3439.

  • Westerdahl, B., and J.O. Becker 2005. Cucurbits: Nematodes. In: UC ANR Publication 344.

  • Chen, X., Jiang, Y., and J.O. Becker 2005. Modification of a semi-selective medium for isolation and quantification of the nematophagous fungus Pochonia chlamydosporia. Journal of Shanghai Jiiaotong University (Science) Vol. E-10:172-175.

  • Becker, J.O., S.T. Koike, and M. LeStrange 2005. Spinach: Nematodes. In: UC ANR Publication 3467.

  • Westerdahl, B., and J.O. Becker 2005. Sugarbeets: Nematodes. In: UC ANR Publication 3469.

  • Borneman, J., R. Olatinwo, B. Yin, and J.O. Becker 2004. An experimental approach for identifying microorganisms involved in specified functions: utilization for understanding a nematode suppressive soil. Australasian Plant Pathology 33:151-155. Doi:10.1071/AP04007

  • Qin, S., J. Gan, W. Liu, and J.O. Becker 2004. Degradation and adsorption of fosthiazate in soil. Journal of Agricultural and Food Chemistry 52:6239-6242. Doi:10.1021/jf049094c

  • Hutchinson, C.M., M.E. McGiffen Jr., J.J. Sims, and J.O. Becker. 2004. Fumigant combinations for Cyperus esculentumL control. Pest Management Science 60:369-374. Doi:10.1002/ps.781

  • Smith-Becker, J., N. Keen, and J.O. Becker 2003. Acibenzolar-S-methyl induces resistance to Colletotrichum lagenariumand cucumber mosaic virus in cantaloupe. Crop Protection 22:769-774. Doi:10.1016/S0261-2194(03)00044-9

  • Yin, B., L. Valinsky, X. Gao, J.O. Becker, and J. Borneman 2003. Bacterial rDNA associated with soil suppressiveness against the plant-parasitic nematode Heterodera schachtii. Applied and Environmental Microbiology 69:1573-1580. Doi:10.1128/AEM.69.3.1573-1580.2003

  • Giblin-Davis, R. M., D.S. Williams, S. Bekal, D.W. Dickson, J.A. Brito, J.O. Becker, and J.F. Preston 2003. 'Candidatus Pasteuria usgae' sp. nov., an obligate endoparasite of the phytoparasitic nematode Belonolaimus longicaudatus. International Journal of Systematic and Evolutionary Microbiology 53:197-200. Doi:10.1099/ijs.0.02292-0

  • Becker, J.O., and B. Westerdahl 2003. Citrus: Nematodes. In: UC ANR Publication 3441

  • Karlik, J.F., J.O. Becker, H.B. Pemberton, and U.K. Schuch 2003. Field rose production. Pp. 580-587. In: Encyclopedia of Rose Science (eds.A. Roberts, T. Debener, and S. Gudin),  Academic Press, NY.

  • Yin, B., L. Valinsky, X. Gao, J. O. Becker, and J. Borneman 2003. Identification of fungal rDNA associated with soil suppressiveness against Heterodera schachtii using oligonucleotide fingerprinting. Phytopathology 93:1006-1013. Doi:10.1094/PHYTO.2003.93.8.1006

  • Xu, J.M, J. Gan, S.K. Papiernik, J.O. Becker, and S.R. Yates 2003. Incorporation of fumigants into soil organic matter. Environmental Science & Technology 37:1288-1291. Doi:10.1021/es026179q

  • Ferris, H., K.M. Jetter, I.A. Zasada, J.J. Chitambar, R.C. Venette, K.M. Klonsky, and J.O. Becker.  2003.  Risk assessment of plant-parasitic nematodes.  Pp 99-119. In: D.A. Sumner (ed.). Exotic Pests and Diseases: Biology and Economics for Biosecurity. Iowa State Press, Ames. Doi:10.1002/9780470290125.ch8.

  • Pyrowolakis, A., A. Westphal, R.A. Sikora, and J.O. Becker 2002. Identification of root-knot nematode suppressive soils. Applied Soil Ecology 19:51-56. Doi:10.1016/S0929-1393(01)00170-6

  • Gao, X. and J.O. Becker 2002. Population development of both sexes of Heterodera schachtii is diminished in a beet cyst nematode-suppressive soil. Biological Control 25:187-194. Doi:10.1016/S1049-9644(02)00061-0

  • Steddom, K., O. Becker, and J.A. Menge 2002. Repetitive applications of the biocontrol agent, Pseudomonas putida06909-rif/nal, and effects on populations of Phytophthora parasitica in citrus orchards.  Phytopathology 92:850-856. Doi:10.1094/PHYTO.2002.92.8.850

  • Karlik, J.F., U.K. Schuch, and J.O. Becker  2001. Bareroot rose production with underground drip irrigation. Acta Horticulturae 547:221-226. Doi:10.17660/ActaHortic.2001.547.26

  • Westphal, A. and J.O. Becker 2001a. Components of soil suppressiveness against Heterodera schachtii. Soil Biology & Biochemistry 33:9-16. Doi:10.1016/S0038-0717(00)00108-5

  • Ma, Q.L., J. Gan, S.K. Papiernik, J.O. Becker, and S.R. Yates 2001. Degradation of soil fumigants as affected by initial concentration and temperature. Journal of Environmental Quality 30:1278-1286. Doi:10.2134/jeq2001.3041278x

  • Westphal, A. and J.O. Becker 2001b. Impact of soil suppressiveness on various population densities of Heterodera schachtii. Annals of Applied Biology 138:371-376. Doi:10.1111/j.1744-7348.2001.tb00122.x

  • Karlik, J.F., J.O. Becker, and U.K. Schuch 2001. IPM for field-grown rose plants in California. Acta Horticulturae 547:97-102. Doi:10.17660/ActaHortic.2001.547.12

  • Bekal, S., J. Borneman, M.S. Springer, R.M. Giblin-Davis, and J.O. Becker 2001. Phenotypic and molecular analysis of a Pasteuria strain parasitic to the sting nematode. Journal of Nematology 33:110-115.

  • Bekal, S., J. Borneman, M.S. Springer, R.M. Giblin-Davis, and J.O. Becker 2001. Phenotypic and molecular analysis of a Pasteuria strain parasitic to the sting nematode. Journal of Nematology 33:110-115.

  • Giblin-Davis, R.M., D.S. Williams, W.P. Wergin, D.W. Dickson, T.E. Hewlett, S. Bekal, and J.O. Becker 2001. Ultrastructure and development of Pasteuria sp. (S-1 strain), an obligate endoparasite of Belonolaimus longicaudatus(Nemata: Tylenchida). Journal of Nematology 33:227-238.

  • Gan, J., C. Hutchinson, F.F. Ernst, J.O. Becker, and S.R. Yates 2000. Column system for concurrent assessment of emission potential and pest control of soil fumigants. Journal of Environmental Quality 29:657-661. Doi:10.2134/jeq2000.00472425002900020038x

  • Becker, J.O., C.M. Hutchinson, J.F. Karlik, and J.J. Sims 2000. Efficacy of methyl bromide and methyl iodide against Pratylenchus spp. harbored in rose roots. Fungicide and Nematicide Tests 55:315.

  • Hutchinson, C., M.E. McGiffen, H.D. Ohr, J.J. Sims, and J.O. Becker 2000. Efficacy of methyl iodide and synergy with chloropicrin for control of fungi. Pest Management Science 56:413-418. Doi:10.1002/(SICI)1526-4998(200005)56:5<413::AID-PS140>3.0.CO;2-J

  • Bekal, S. and J.O. Becker 2000. Host range of a California sting nematode population. HortScience 35:1276-1278. Doi:10.21273/HORTSCI.35.7.1276

  • Xue, S.K., J. Gan, S.R. Yates, and J.O. Becker 2000. Nematode response to methyl bromide and 1,3-dichloropropene soil fumigation at different temperatures. Pest Management Science 56:737-742. Doi: 10.1002/1526-4998(200009)56:9<737::AID-PS192>3.0.CO;2-G

  • Bekal, S. and J.O. Becker 2000. Population dynamics of the sting nematode in California turfgrass. Plant Disease 84:1081-1084. Doi:10.1094/PDIS.2000.84.10.1081

  • Gan, J., J.O. Becker, F.F. Ernst, C. Hutchinson, J.A. Knuteson, and S.R. Yates 2000. Surface application of ammonium thiosulfate to reduce 1,3-dichloropropene volatilization from soil. Pest Management Science 56:264-270. Doi:10.1002/(SICI)1526-4998(200003)56:3<264::AID-PS136>3.0.CO;2-X

  • Westphal, A. and J.O. Becker 2000. Transfer of biological soil suppressiveness against Heterodera schachtii. Phytopathology 90:401-406. Doi:10.1094/PHYTO.2000.90.4.401

  • Gan, J., S.R. Yates, J. Knuteson, and J.O. Becker 2000. Transformation of 1,3-dichloropropene in soil by thiosulfate fertilizers. J. Environmental Quality 29:1476-1481. Doi:10.2134/jeq2000.00472425002900050014x

  • Westphal, A. and J.O. Becker 1999. Biological suppression and natural population decline of Heterodera schachtii in a California field. Phytopathology 89:434-440. Doi:10.1094/PHYTO.1999.89.5.434

  • Hutchinson, C., M.E. McGiffen, H.D. Ohr, J.J. Sims, and J.O. Becker 1999. Efficacy of methyl iodide soil fumigation for control of Meloidogyne incognita, Tylenchulus semipenetrans, and Heterodera schachtii. Nematology 1:407-414. Doi:10.1163/156854199508414

  • Neipp, P. and J.O. Becker 1999. Evaluation of biocontrol activity of rhizobacteria from Beta vulgaris against Heterodera schachtii. Journal of Nematology 31:54-61.

  • Hutchinson, C., M.E. McGiffen, Jr., H.D. Ohr, J.J. Sims, and J.O. Becker 1999. Evaluation of methyl iodide as a soil fumigant for root-knot control in carrot production. Plant Disease 83:33-36. Doi:10.1094/PDIS.1999.83.1.33

  • Huang, X. and J.O. Becker 1999. Life cycle and mating behavior of Belonolaimus longicaudatus in gnotobiotic culture. Journal of Nematology 31:70-74.

  • Koenning, S.R., C. Overstreet, J.W. Noling, P.A. Donald, J.O. Becker, and B.A. Fortnum 1999. Survey of crop losses in response to phytoparasitic nematodes in the United States for 1994. Journal of Nematology 31:587-618.

  • Gan, J., S.R. Yates, D. Crowley, and J.O. Becker 1998. Acceleration of 1,3-dichloropropene degradation by organic amendments and potential application for emission reduction. Journal of Environmental Quality 27:408-414. Doi:10.2134/jeq1998.00472425002700020023x

  • Zhang, W., M.E. McGiffen, Jr., J.O. Becker, H.D. Ohr, J.J. Sims, and S.D. Campbell 1998. Effects of soil physical factors on methyl iodide and methyl bromide fumigation. Pesticide Science 53:71-79. Doi:10.1002/(SICI)1096-9063(199805)53:1<71::AID-PS731>3.0.CO;2-S

  • Becker, J.O., H.D. Ohr, N.M. Grech, M.E. McGiffen, Jr., and J.J. Sims 1998. Evaluations of Methyl Iodide as a Soil Fumigant in Container and Small Field Plot Studies. Pesticide Science 52:58-62. Doi:10.1002/(SICI)1096-9063(199801)52:1<58::AID-PS632>3.0.CO;2-Y

  • Nyczepir, A.P. and J.O. Becker 1998. Fruit and citrus trees. In: Agronomy (Madison); Plant-Nematode Interactions (Barker, K.R., Pederson, G.A. and Windham, G.L. eds) ASA-CSSA-SSSA Monograph 36, 637-684. Doi:10.2134/agronmonogr36.c26.

  • Gan, J., S.R. Yates, J.O. Becker, and D. Wang 1998. Surface amendment of fertilizer ammonium thiosulfate to reduce methyl bromide emission from soil. Environmental Science & Technology 32:2438-2441. Doi:10.1021/es9707318

  • Zhang, W.M., M.E. McGiffen, Jr., J.O. Becker, H.D. Ohr, J.J. Sims, and R.L. Kallenbach 1997. Dosage response of weeds to methyl iodide and methyl bromide. Weed Research 37:181-189. Doi:10.1046/j.1365-3180.1997.d01-15.x

  • Becker, J.O. and J. Mueller 1997. Evaluation of emulsifiable 1,3-dichloropropene for control of root-knot nematodes in tomato. Fungicide and Nematicide Tests 52:209.

  • Huang, X. and J.O. Becker 1997. In vitro culture and feeding behavior of Belonolaimus longicaudatus on excised Zea mays roots. Journal of Nematology 29:411-415.

  • Wang, D., S.R. Yates, F.F. Ernst, J. Gan, F. Gao, and J.O. Becker 1997. Methyl bromide emission reduction with field management practices. Environmental Science & Technology 31:3017-3022. Doi:10.1021/es970275n

  • Becker, J.O., A.F. Wrona, and R.T. Lewellen 1996. Effect of solarization and soil fumigation on sugar beet cyst nematode population. Biological and Cultural Tests for Control of Plant Diseases 11:19.

  • Ohr, H.D., J.J. Sims, N.M. Grech, J.O. Becker, and M.E. McGiffin, Jr. 1996. Methyl iodide, an ozone-safe alternative for methyl bromide as a soil fumigant. Plant Disease 80:731-735. Doi:10.1094/PD-80-0731

  • Becker, J.O. and A.F. Wrona 1995. Effect of solarization and soil fumigation on Pythium, nematodes, weeds and carrot yield. Biological and Cultural Tests for Control of Plant Diseases 10:134.

  • Becker, J.O. 1995 Spot-treatment of turfgrass with a soil fumigant to suppress sting nematodes. Fungicide and Nematicide Tests 50:211.

  • Wrona, A.F. and J.O. Becker 1995. Suppression of sugar beet damping-off by a combination of soil fumigation and solarization. Fungicide and Nematicide Tests 50:239.

  • Hill, D.S., J.I. Stein, N.R. Torkewitz, A.M. Morse, C.R. Howell, J.P. Pachlatko, J.O. Becker, and J.M. Ligon 1994. Cloning of genes involved in the synthesis of pyrrolnitrin from Pseudomonas fluorescens and the role of pyrrolnitrin synthesis in biological control of plant disease. Applied and Environmental Microbiology 60:78-85. DOI:https://doi.org/10.1128/aem.60.1.78-85.1994

  • Gaffney, T.D., S.T. Lam, J. Ligon, K. Gates, A. Frazelle, J. Di Maio, S. Hill, S. Goodwin, N. Torkewitz, A.M. Allshouse, H.-J. Kempf, and J.O. Becker 1994. Global regulation of expression of antifungal factors by a Pseudomonas fluorescensbiological control strain. Molecular Plant-Microbe Interactions 7:455-463.

  • Mundo-Ocampo, M., J.O. Becker, and J. Baldwin 1994. Occurrence of Belonolaimus longicaudatus in turf in the Coachella Valley. Plant Disease 78:529.

  • Noling, J.W. and Becker, J.O. 1994. The challenge of research and extension to define and implement alternatives to methyl bromide. Journal of Nematology 26:573-586. 

  • Becker, J.O. and F.J. Schwinn 1993. Control of soil-borne pathogens with living bacteria and fungi: status and outlook. Pesticide Science 37:355-363.

  • Schroth, M.N. and J.O. Becker 1990. Concepts of ecological and physiological activities of rhizobacteria related to biological-control and plant-growth promotion. In: Biological control of soil-borne plant pathogens (Ed. D. Hornby), CAB International, Wallingford, UK, 389-414.

  • Becker, J.O., C.A. Hepfer, G.Y. Yuen, S.D. Van Gundy, M.N. Schroth, J.G. Hancock, A.R. Weinhold, and T. Bowman 1990. Effect of rhizobacteria and metam-sodium on growth and root microflora of celery cultivars. Phytopathology 80:206-211.

  • Becker, J.O., S.F. Colbert, M.N. Schroth, and S.D. Van Gundy 1989. Field evaluation of a rhizobacterial strain for affecting root-knot nematodes. Biological and Cultural Tests for Control of Plant Diseases 4:31.

  • Becker, J.O., S.F. Colbert, M.N. Schroth, and S.D. Van Gundy 1989. Field evaluation of a rhizobacterial strain for affecting root-knot nematodes. Biological and Cultural Tests for Control of Plant Diseases 4:31.

  • Becker, J.O., M. Monson, S.D. Van Gundy, and M.N. Schroth 1989. The use of a drip irrigation system for infestation of field plots with nematodes. Journal of Nematology 21:524-529.

  • Becker, J.O., E. Zavaleta-Mejia, S. Colbert, M.N. Schroth, A.R. Weinhold, J.G. Hancock, and S.D. Van Gundy 1988. Effects of rhizobacteria on root-knot nematodes and gall formation. Phytopathology 78:1466-1469.

  • Becker, J.O., C. Hepfer, S. Van Gundy, A.R. Weinhold, J.G. Hancock, and M.N. Schroth 1988. Growth response of celery cultivars after inoculation of seedlings with rhizobacteria. Biological and Cultural Tests for Control of Plant Diseases 3:15.

  • Becker, J.O., C. Hepfer, S. Van Gundy, A.R. Weinhold, J.G. Hancock, and M.N. Schroth 1988. Growth response of celery cultivars after inoculation of seedlings with rhizobacteria. Biological and Cultural Tests for Control of Plant Diseases 3:15.

  • Becker, J.O. and R.J. Cook 1988. Role of siderophores in suppression of Pythium species and production of increased-growth response. Phytopathology 78:778–782.

  • Becker, J.O., S. Van Gundy, J.G. Hancock, A.R. Weinhold, and M.N. Schroth 1987. Biocontrol of root pathogens of celery by treating transplants with rhizobacteria. Biological and Cultural Tests for Control of Plant Diseases 2:10.

  • Becker, J.O., S. Van Gundy, J.G. Hancock, A.R. Weinhold, and M.N. Schroth 1987. Biocontrol of root pathogens of celery by treating transplants with rhizobacteria. Biological and Cultural Tests for Control of Plant Diseases 2:10.

  • Zhang, B.X. and J.O. Becker 1987. Biological control of plant pathogens. Scientific Technology (Beijing) 3:54–57.

  • Becker, J.O., E. Messens, and R.W. Hedges 1986. A convenient autoradiographic technique for study of uptake of minerals by plant roots and the effect of environmental factors upon the process. Plant and Soil 92:299–302.

  • Becker, J.O., R.W. Hedges, and E. Messens 1986. Diverse effects of some bacterial siderophores on the uptake of iron by plants. In: Iron, Siderophores and Plant Disease (Ed. T. R. Swinburne), Plenum Press, New York, 61-70. Doi:10.1007/978-1-4615-9480-2_8.

  • Becker, J.O. and H. Fehrmann 1985. Fungal populations of the haulm base of wheat. FEMS Microbiology Ecology 31:311–315.

  • Becker, J.O., E. Messens, and R.W. Hedges 1985. Influence of agrobactin on the uptake of ferric iron by plants. FEMS Microbiology Ecology 31:171–175.

  • Becker, J.O., R.W. Hedges, and E. Messens 1985. Inhibitory effect of pseudobactin on the uptake of ferric iron by higher plants. Applied and Environmental Microbiology 49:1090–1093.

  • Darvas, J.M. and J.O. Becker 1984. Failure to control Phytophthora cinnamomi and Pythium splendens with metalaxyl after its prolonged use. Citrus and Subtropical Fruit Journal 603:9–11.

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