Thrips/TSWV status in Yolo & Colusa

2025 3rd Report-- April 30

April 30, 2025
By Neil McRoberts, Patricia A Lazicki
Thrips population Thrips are currently in Generation 2, with adults predicted to peak in the second week of May. Spring temperatures remain similar to long-term normals, and population predictions have not changed much from last update.  Thrips and TSWV monitoring We have started to monitor thrips…
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2025 Second Report-- April 16th

April 16, 2025
By Patricia A Lazicki, Neil McRoberts
General situation The oldest tomatoes have been in ground for more than a month, and planting is progressing rapidly. The warm weather in the past two weeks has pushed thrips population projections forward by a few days compared to the last report.  Thrips population First-generation adults are still…
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2025 First Report-- April 2

April 2, 2025
By Patricia A Lazicki
General situation, thrips population development Planting is in full swing. Temperatures and precipitation this spring are close to historic norms, and the thrips population predictions are very similar to those we saw last year. We’re currently at the peak of 1st-generation adults; they’ll be laying their…
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2024 9th Report (June 14)

June 14, 2024
By Patricia A Lazicki
General situation Almost all tomatoes are now in the ground. New TSWV infections will cause more yield loss in later than earlier plantings since the younger the plant is when it is infected, the more severe the disease will be.
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2024 8th Report (May 30th)

May 30, 2024
By Patricia A Lazicki
General situation Temperatures over the past few weeks have been in the 80s and 90s, ideal conditions for thrips development. The hot weather coming up is also expected to accelerate thrips development and activity.
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