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Agenda 2017

The 63rd Annual Conference on Soilborne Plant Pathogens


The 49th California Nematology Workshop


March 28-30, 2017


University of California, Davis

   Storer and Hutchison Halls




Tuesday March 28, 2017


8:00 am -3:30 pm

Field trip. Stops include Foundation Plant Services (,  Bayer CropScience- Biologics, and the California Department of Food and Agriculture Plant Pest Diagnostic Center in Sacramento. Lunch included.  Separate registration ticket required ($50).  Limited to first 45.




The program is also full, so we cannot take any new speakers, but registration to the meeting is still open


4:00-5:30 pm

UC DANR Nematology Workgroup – Kosuge Conference Room – 357 Hutchison Hall


5:00-6:00 pm

Registration for Conference on Soilborne Plant Pathogens opens – Student Community Center


6:00-8:30 pm

Social and dinner – Student Community Center


 Wednesday March 29, 2017


8:00-8:30 am

Registration-  Storer Hall Lobby


8:30-10:00 am 

Opening Session: Deploying Host Resistance for Soilborne Disease Control – 1322 Storer Hall

Welcome: David Rizzo, Chair, Department of Plant Pathology

Steve Knapp and Glenn Cole, UC Davis. The Ultimate Quest: developing strawberries with soilborne disease resistance.


Richard Michelmore and Maria Jose-Truco  UC Davis.  Genetic approaches to control of root diseases of lettuce


10:00-10:30 am         Coffee break



Session I.  New developments in the realm of soilborne pathogens and pests.

Session Chair: Alex Putman, UC Riverside:

Transgenic resistance for managing soil‐borne bacterial wilt disease of tomato in open field conditions. Sanju Kunwar, University of Florida.

Fusarium oxysporum f. sp. mori, a new and polyphyletic forma specialis causing Fusarium wilt of blackberry. Ana M. Pastrana Leon, UC Davis.

Disease management challenges in the establishment of stevia as a new crop in the southeast. Alyssa Koehler, NC State University.

Validation and refinement of a predictive model for Sclerotinia sclerotiorum apothecial development in soybean fields. Jaime Willbur, University of Wisconsin Madison.

New findings of Rhizoctonia anastomosis groups, symptoms and epidemiology in horticultural crops. James Woodhall, University of Idaho.

Deciphering modes of action: Temporal soil physiochemical, metabolomics and microbiome changes in anaerobic soil disinfestation. Shashika Hewavitharana1, R. Leisso2, D. Rudell2, Mark Mazzola2, 1Washington State University and 2USDA-ARS.


Noon-1:30 pm           Lunch – Student Community Center


1:30-3:00 pm

Session II. New developments in the realm of soilborne pathogens and pests.

    Session Chair: Andreas Westphal, UC Riverside, Parlier.

Nematode host status of Crotalaria juncea, a potential orchard cover crop. Mark Castanon and Andreas Westphal, UC Riverside.

Root-knot nematodes on Pitahaya. Ying-Yu Chen1, Haiyan Wu2, Angelo Loffredo1, Ramiro Lobo3, and J. Ole Becker1. 1UC Riverside, 2Guangxi University, Nanning, and 3UCCE San Diego County.

Soybean sudden death syndrome: variation in disease intensity, pathogen density and yield at different spatial scales. Muhammad Raza. Iowa State University.

Using trap crops to manage plant parasitic nematodes on vegetable crops. Becky Westerdahl, UC Davis.

Creating cyst nematode suppressive soils using a cropping decision model. James Borneman and J. Ole Becker, UC Riverside.

Mitigation of nematode-caused crop damage with microbial metabolites and natural antagonists. Angelo Loffredo, Jennifer Smith Becker, and J. Ole Becker, UC Riverside.


3:00-3:30 pm              Coffee break


3:30-5:00 pm

Session III. Chemical, Biological, and cultural control of soilborne diseases.

  Session Chair: Kelly Ivors, California Polytechnic State University.


Fusarium root rot controlled by Trichoderma harzianum on olive trees. Maroua Ben Amira, Blaise Pascal University (France).

Management of root rot diseases of wheat caused by Fusarium graminearum and Rhizoctonia solani using resistance and biological control agents. Tanveer Hussain and Anthony Adesemoye, University of Nebraska.

Synthetic elicitor activates defense response in Arabidopsis and protects cowpea plants against Fusarium oxysporum. Mercedes Schroeder, UC Riverside.

Dominus biofumigant for control of soil diseases, nematodes and weeds. George Stallings. Isagro.

California fresh market carrot production without fumigant nematicides? J. Ole Becker1, Antoon Ploeg1, and Joe Nunez2. 1UC Riverside; 2UCCE Kern County.

New chemistry for nematode management. Saad Hafez, University of Idaho.

Nematode management in sweetpotato. Antoon Ploeg, UC Riverside.

A modified protocol for phenotyping Fusarium wilt disease resistance in cowpea.  Arsenio Ndeve et al. UC Riverside

Purpureocillium lilacinum: important fungal biologic for integrated control of plant parasitic nematodes. Kristi Sanchez et al. Bayer.


Thursday March 30, 2017


7:00-8:00 am              Steering Committee Meeting  – Kosuge Conference Room – 357 Hutchison Hall


8:30-10:00 am            Session IV. Soilborne Oomycete diseases. Session Chair: Greg Browne, USDA-ARS Davis:

Plasmopara halstedii, a soilborne downy mildew. Ryan Humann, Syngenta.

Oomycete and fungal root communities associated with Prunus replant disease and its control in conventionally fumigated or anaerobically disinfested soil.  Natalia Ott, USDA-ARS, Dept. of Plant Pathology, UC Davis.

Phytophthora impacts to ecosystem and landscape processes. Richard Cobb, UC Davis.

Population dynamics of Phytophthora species in coastal watersheds of California. Kamyar Aram, UC Davis.

Characterization of oomycetes in irrigation water using high-throughput sequencing of nucleic acid. Neelam Redekar, Oregon State University.

Using LAMP and qPCR assays to investigate the epidemiology of Pythium ultimum in potatoes. Phillip Wharton, University of Idaho.

Influence of Pythium spp., unknown as pathogenic to rice, on the emergence of rice seedlings in flooded fields. Takeshi Toda, Akita Prefectural University.

10:00-10:30 am         Coffee break



Session V. Hot Topic: Showcasing diseases of grape. Session Chair: Doug Gubler, UC Davis

Michael McKenry, UC Riverside emeritus, Nematode management in grape.

Andrew Walker, UC Davis. Development of grape rootstocks for resistance to soilborne diseases.

Doug Gubler, UC Davis emeritus. Effects of new grapevine rootstocks on incidence of soilborne diseases.




The Conference on Soilborne Plant Pathogens would like to thank our corporate sponsors for their support. Their contributions went to cover student scholarships, lunches, and food for the social.




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