- Author: Neil McRoberts
Dixon area
The first generation of thrips post winter peaked around March 31. We are currently expecting peak egg hatch for generation 2 to be happening right now, and generation 2 numbers to peak around May 8th. The forecast temperatures over the next 3 days are ideal for thrips development but if the forecast cooler and wet weather occurs on Friday/Saturday development may be delayed will be delayed and there may be some thrips mortality. The early season overall is running slightly ahead of the 30 year average and we are expecting the third generation of adults to peak in the first week of June. So far we have no reports of TSWV in other susceptible crops in the area so immediate risk of infection is low. If you are planning to use an insecticide to suppress thrips numbers, immediate action will impact generation 2. Later applications (in mid to late May) will impact generation 3. Contact your PCA or local UCCE adviser if you would like further advice on spray timing.
Gilroy/Hollister area
The first generation of adult thrips post winter is peaked on March 8th and the second generation will peak on 4/25. Immediate action will help to suppress this generation, but TSWV risk is currently low another option would be to focus early season treatment on generation 3; adults of generation 3 will peak on May 31. The forecast temperatures over the next 3 days are ideal for thrips development but if the forecast cooler and wet weather occurs on Friday/Saturday, development may be delayed and there may be some thrips mortality. The early season overall is running slightly ahead of the 30 year average. We have no reports of TSWV in the area and the immediate risk of TSWV is low.