Intermountain Research and Extension Center
Intermountain Research and Extension Center
Intermountain Research and Extension Center
University of California
Intermountain Research and Extension Center

Onion Projects

410-Stop the Rot - Management of Bacterial Diseases in Onions

Prinicipal Investigator: Rob Wilson, Center Director/Farm Advisor, UC-IREC, Tulelake, CA; Lindsey duToit, Extension Plant Pathologist, Washington State University, Mt. Vernon, WA; Brenna Aegerter, Ph.D., Farm Advisor, UCCE-San Joaquin, Stockton, CA; Alex Putnam, Plant Pathology Specialist, UC-Riverside CA; Jaspreet Sidhu, Ph.D., Vegetable Crops Farm Advisor, UCCE-Kern, Bakersfield CA.

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  • The first step of the study is to determine which bacterial pathogens are causing disease symptoms in Tulelake by collecting samples from grower fields and sending them to regional labs for identification.   The second step is to evaluate the influence of management practices on the incidence and severity of bacterial disease in onions. 

451-Management of White Rot of Onions with Trap Crops

Principal Investigator:  Rob Wilson, Center Director/Farm Advisor, UC Intermountain Research & Extension Center

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  • Determine if tank-mixing fluopyram, solatenol, fluxapyroxad, or penthiopyrad with tebuconazole increases full-season white rot suppression compared to using the products individually.
  • Determine the efficacy of thiram and FarMore 300 fungicide seed treatments used alone and in combination with tebuconazole for suppression of white rot and other onion diseases including smut and pink root.
  • Determine if narrowing the band-width of penthiopyrad in-furrow improves white rot suppression by increasing the fungicide concentration near the basal plate (not possible with tebuconazole due to phytotoxicity).
  • Investigate the potential of using a controlled release formulation of tebuconazole in-furrow at planting to increase the concentration of tebuconazole in August and September to improve white rot suppression.

458-Managing Maggots in Processing Onions

Principa; Investigator: Rob Wilson, Center Director/Farm Advisor, UC Intermountain Research & Extension Center, Tulelake; Rachael Long, Field Crops and Pest Management Farm Advisor, UCCE-Capitol Corridor, Woodland; Mariano Galla, UC-Davis.

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  • Replicate certain insecticide treatments tested in 2016 and 2017 to better determine efficacy of different seed treatment insecticides and coatings.
  • Compare the efficacy of currently registered herbicides applied at recommended timings in different regions (CA, NY, Southern Canada) to determine the consistency of treatment effectiveness on different maggot populations and different growing conditions.
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