The University of California Agriculture and Natural Resources (UC ANR) released an update on April 15 regarding the progression of thrips development for the start of the 2026 season. The organization said that, similar to last year, updates have been delayed due to ongoing issues with the UC ANR web platform. As a result, thrips monitoring will be reported through alternative channels at least for the beginning of this season.
The report highlights that the first post-winter generation of adult thrips peaked around March 15, which is approximately two weeks earlier than in 2025. Peak egg hatch for the second generation occurred around March 30, and it is anticipated that adults from this generation will reach their peak within six to seven days from now. According to current development rates and projected temperatures, a third generation peak is expected around May 26. The update notes: “Unless there is evidence of TSWV in crops already, it is unlikely that treatment for thrips will be useful at this time until the third generation at the earliest.”
UC ANR secures funding through public contributions to support its programs, according to the official website. The organization also promotes sustainable practices aimed at strengthening resilient ecosystems and economic vitality according to its official website.
As part of its research efforts, UC ANR utilizes nine research and extension centers as laboratories representing California’s diverse ecosystems according to its official website. The institution has gained recognition for providing trusted services that link research findings directly with community needs according to its official website.
UC ANR operates within the University of California system by managing Cooperative Extension services according to its official website. Each year, it conducts over 33,800 educational events and involves more than 18,400 volunteers in various initiatives according to its official website.
The continued monitoring and timely reporting on pest populations such as thrips play an important role in supporting agricultural decision-making across California.
