Thrips/TSWV Western San Joaquin Co.
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2025 fourth report

May 23, 2025 Update

General Situation: Daily high temperatures will be sitting between the mid 70s and 90F over the next 10 days.  These are ideal conditions for thrips development.

Thrips development: Generation 3 adults will reach their peak numbers around May 30th.  Generation 4 will be developing on plants during the first 3 weeks of June, reaching peak adults around June 25th.  For most crops these two generations will present the highest risk of TSWV spreading and causing yield loss.  Focusing thrips treatments into the next 4-6 week window will help keep TSWV damage to a minimum.