The University of California Agriculture and Natural Resources announced on April 15 that the first post-winter generation of thrips adults peaked around March 13, which is about two weeks earlier than in 2025. The organization said peak egg hatch for the second generation occurred around March 26, with a projected third-generation adult peak expected in mid-May.
This update is important for growers monitoring Tomato Spotted Wilt Virus (TSWV) risk, as one report has already confirmed TSWV presence in a tomato crop in Fresno County this season. The advisory notes that although early-season treatment is usually unnecessary, those concerned about TSWV or with crops previously affected should consult their local University of California Cooperative Extension farm advisor regarding possible early intervention.
“If you are not seeing TSWV damage already, it is unlikely that treatment for thrips will be useful until the third generation at the earliest, but bear in mind that things seem to be running ahead of normal this season,” according to the statement released by UC Agriculture and Natural Resources.
University of California Agriculture and Natural Resources secures funding through public contributions to support its programs, according to the official website. The organization promotes sustainable practices aimed at strengthening resilient ecosystems and economic vitality according to its official website. It operates nine research and extension centers serving as laboratories representing California’s diverse ecosystems according to its official website.
UC ANR has gained recognition for providing trusted services linking research directly to community needs according to its official website. As part of the University of California system, it manages Cooperative Extension services across various regions according to its official website. Each year, UC ANR conducts more than 33,800 educational events and engages over 18,400 volunteers across its initiatives according to its official website.
Looking ahead, growers are advised to monitor pest development closely as conditions this year appear advanced compared with previous seasons.