Division of Agriculture and Natural Resources
University of California
Division of Agriculture and Natural Resources

Steven T. Koike

Photo of Steven T. Koike
Plant Pathology Farm Advisor
Cooperative Extension Monterey County
1432 Abbott Street
Salinas, CA 93901
(831) 759-7356
stkoike@ucanr.edu Create VCard

Also in:
Santa Cruz County

Links

Biography

Steven Koike joined the Monterey County office of UC Cooperative Extension in 1989. As Plant Pathology Farm Advisor, he is involved in educational programs and applied research in vegetable, fruit, and ornamental crop diseases. His research focuses on diseases of vegetables/strawberry/flower crops, epidemiology of diseases, fungicide evaluations, identification of new diseases, and exploration of alternative controls (alternative fungicides, biological agents, organic agriculture disease management). He has also been involved in research of foodborne pathogens (E. coli and Salmonella) as they occur in leafy greens field settings. Educational efforts consist of informing clientele of research results, tailoring results to commercial operations, and diagnosing problems. Koike operates the UC Cooperative Extension plant pathology diagnostic lab located in Salinas. In 2007 he published the book A Color Handbook of Diseases of Vegetables (Manson Publishing, London). He received the University of California ANR Distinguished Service Award for Outstanding Research in 2002 and 2011. In 2013 Koike was awarded the Excellence in Extension Award from the American Phytopathological Society.

Education

M. S. Plant Protection and Pest Management, UC Davis. 1980
B. S. Plant Science/Plant Pathology, UC Davis. 1978

Specialty

Plant pathology research and education for vegetable, fruit and ornamental crops; plant disease diagnostics; food safey research and extension.

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

Bibliography

Peer Reviewed

  • Liu, H.Y., D. Xu, et al. (2011). "Biological characterization and complete genomic sequence of Apium virus Y infecting celery." Virus Research 155: 76-82.
  • Cahn, M.D., M. LeStrange, et al. (2011). Broccoli production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7211
  • Baameur, A., S.T. Koike, et al. (2011). "Cercosporoid leaf pathogens from whorled milkweed and spineless safflower in California." IMA Fungus 2: 7-12.
  • Sullivan, M.J., S.T. Koike, et al. (2011). "Characterization of white rust of perennial pepperweed caused by Albugo candida in California." Plant Disease 95: 876-877.
  • Aguiar, J., R. Smith, et al. (2011). Chile pepper production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7244
  • Bi, J., R. Smith, et al. (2011). Cilantro production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7236
  • Koike, S.T., S.J. Mauzey, et al. (2011). "First report of bacterial blight of cabbage (Brassica oleracea var. capitata) caused by Pseudomonas cannabina pv. lisalensis in California." Plant Disease 95: 71.
  • Koike, S.T. (2011). "Fusarium crown and root rot of tarragon in California caused by Fusarium solani." Plant Disease 95: 768.
  • Cahn, M., R. Smith, et al. (2011). Green onion production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7243
  • Koike, S.T., B.M. Wu, et al. (2011). "Impact of consumer-driven changes to crop production practices on lettuce drop caused by Sclerotinia sclerotiorum and S. minor." Phytopathology 101: 340-348.
  • Wu, B.M., P. Chitrampalam, et al. (2011). "Interactions between Coniothyrium minitans and Sclerotinia minor affect biocontrol efficacy of C. minitans." Phytopathology 101: 358-366.
  • Cahn, M., R. Smith, et al. (2011). Leaf lettuce production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7216
  • Clarke, C.R., C.T. Bull, et al. (2011). "Multilocus sequence typing of Pseudomonas syringae sensu lato confirms previously described genomospecies and permits rapid identification of P. syringae pv. coriandricola and P. syringae pv. apii causing bacterial leaf spot on parsley." Phytopathology 101: 847-858.
  • Vallad, G.E., S.M.C. Njoroge, et al. (2011). "Phenological and phytochemical changes correlate with differential interactions of Verticillium dahliae with broccoli and cauliflower." Phytopathology 101: 523-534.
  • Koike, S.T. and W.D. Gubler (2011). Powdery mildew on fruits and berries. Pest Notes. UC ANR publications. Publication 7494
  • Cahn, M.D., S.T. Koike, et al. (2011). Spinach production in California. Vegetable production series. University of California Agricultural and Natural Resources. Publication 7212
  • Bluhm, B.H., J.C. Correll, et al. (2011). "Spinach: Better management of downy mildew and white rust through genomics." European Journal of Plant Pathology (Special Issue) 129: 193-205.
  • Mauzey, S.J., C.T. Bull, et al. (2010). "First report of bacterial blight of Brussels sprouts (Brassica oleracea var. gemmifera) caused by Pseudomonas cannabina pv. alisalensis in California." Plant Disease 94: 1375.

Non-Peer Reviewed

  • Koike, S.T. (2011). "Aliens continue to invade the west." American Vegetable Grower July 2011: 34.
  • Koike, S.T. (2011). Angular leaf spot of strawberry persists into spring. Strawberries and Caneberries ANR blog.
  • Bull, C. and S.T. Koike (2011). Bacterial leaf spot of parsley: characterization of a new disease. Monterey County Crop Notes. March/April 2011
  • Koike, S.T. (2011). Biology and management of Macrophomina disease of strawberry in California. California Strawberry Commission Annual Production Research Report 2009-2010.: 41-51.
  • Szabo, L.J. and S.T. Koike (2011). Characterizing rust of leek. Monterey County Crop Notes. January/February 2011
  • Koike, S.T. (2011). Coastal tomato affected by speck in 2011. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T. (2011). Coastal weather enhances Botrytis crown rot of lettuce. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T., K.D. Larson, et al. (2011). Development of a genetic screen for characterizing tolerance/resistance to Macrophomina phaseolina in strawberry cultivars and advanced selections in the University of California strawberry cultivar improvement program. 7th North American Strawberry Symposium & 35th North American Strawberry Growers Association Conference. Tampa, Florida,
  • Szabo, L.J. and S.T. Koike (2011). Leaf diseases of carrot. Monterey County Crop Notes. May/June 2011
  • Koike, S.T. and J. Correll (2011). Naming of a new race (race Pfs 12) of the spinach downy mildew pathogen. Monterey County Crop Notes. January/February 2011
  • Koike, S.T. and J. Correll (2011). Naming of a new race (race Pfs 12) of the spinach downy mildew pathogen. Salinas Valley Agriculture UCCE blog. March 3, 2011
  • Koike, S.T. and J.C. Correll (2011). Naming of another new race (race Pfs 13) of the spinach downy mildew pathogen. Monterey County Crop Notes. July/August 2011
  • Koike, S.T. and J.C. Correll (2011). Naming of another new race (race Pfs 13) of the spinach downy mildew pathogen. Salinas Valley Agriculture UCCE blog. August 5, 2011
  • Koike, S.T. (2011). "New leaf spot diseases appear on parsley." Vegetables West 15: 14-15.
  • Koike, S.T. (2011). Operating a state-wide strawberry disease diagnostic services center. California Strawberry Commission Annual Production Research Report 2008-2009.: 53-57.
  • Koike, S.T. (2011). Plants and their pathogens: what you should know about host range and pathogen lists. Proceedings. 27th annual pest and production management conference, San Diego, California, Society of American Florists.
  • Subbarao, K., S.T. Koike, et al. (2011). Production on 80-inch beds impacts lettuce drop disease. Monterey County Crop Notes. March/April 2011
  • Feng, C., J.C. Correll, et al. (2011). Race diversity and the biology of the spinach downy mildew pathogen: reactions to a number of downy mildew pathogen strains. Preogress report. California Leafy Greens Research Board.
  • Gordon, T.R., S.T. Koike, et al. (2011). Recent developments regarding strawberry collapse problems in California caused by Fusarium and Macrophomina. 7th North American Strawberry Symposium & 35th North American Strawberry Growers Association Conference. Tampa, Florida,
  • Koike, S.T. and C. Bull (2011). Show us your spots: researchers need samples of bacterial leaf spots of celery, cilantro, parsley, and other crops. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T., O. Daugovish, et al. (2011). Strawberry variety and fumigant performance for management of Macrophomina phaseolina and Fusarium oxysporum in California. 7th North American Strawberry Symposium & 35th North American Strawberry Growers Association Conference. Tampa, Florida,
  • Koike, S.T. (2011). Studies on epidemiology of disease caused by Apium virus Y. Annual Report 2008-2009. California Celery Research Advisory Board.: 19-28.
  • Koike, S.T. (2011). Survival of E. coli on soil amendments and irrigation water in leafy green field environments. Produce Research Symposium. Orlando, Florida, Center for Produce Safety.
  • Koike, S.T. (2011). "The role of weeds in disease problems affecting crops." CAPCA Advisor 14: 24-26.
  • Koike, S.T. (2011). Two different Sclerotinia species affect coastal crops. Central Coast Agriculture Highlights (UCCE newsletter for Santa Barbara and San Luis Obispo counties).
  • Koike, S.T. and M. Bolda (2011). Verticillium wilt showing up in Watsonville-Salinas strawberry fields. Strawberries and Caneberries ANR blog.
  • Koike, S.T. (2011). Wilting lettuce plants damaged by soil and wind factors. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T. (2011). Winter white mold affecting vegetable crops. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T. (2010). "Crop focus on lettuce: Tale of two viruses." American Vegetable Grower October 2010: 22-24.
  • Cahn, M., S.T. Koike, et al. (2010). Field survival of E. coli in a spinach production system. Progress report. California Leafy Greens Research Board.
  • Du Toit, L.J., J.C. Correll, et al. (2010). Guidelines for spinach downy mildew, Peronospora farinosa f. sp. spinaciae (Pfs): APS-ISF collaboration to implement a system to standardize identification of plant pathogen races and strains based on host differentials. International Seed Federation initiative paper.: 8.
  • Koike, S.T. (2010). Looking ahead: head rot can be issue for winter and early spring broccoli. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T. (2010). "Plant problem diagnosis: a critical skill for agriculturalists." CAPCA Advisor 13: 30-33.
  • Koike, S.T. and J.C. Correll (2010). Race diversity and the biology of the spinach downy mildew pathogen. Progress report. California Leafy Greens Research Board.
  • Koike, S.T. (2010). Rains bring on leaf blotch disease of strawberry. Strawberries and Caneberries ANR blog.
  • Daugovish, O. and S.T. Koike (2010). "Research on new celery virus identifies control measures." Uc Delivers
  • Cahn, M., S.T. Koike, et al. (2010). Survival of E. coli under a commercial spinach production environment. Food Safety and Water Quality Comanagement Forum. Watsonville,
  • Koike, S.T. (2010). Tomato spotted wilt virus hitting lettuce crops. Salinas Valley Agriculture UCCE blog.
  • Koike, S.T. (2010). Vectors of viruses: A review. Monterey County Crop Notes. November/December 2010

ANR Publications

California Agriculture Article Contributions

ANR Workgroup Associations

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