Thrips/TSWV Merced
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2025 fourth report

May 23, 2025 Update

General Situation: Daily high temperatures will be sitting between the mid 80s and 100F over the next 10 days.  These are good conditions for thrips development, but sustained highs close to 100F may slow population growth down a little.

Thrips development: Generation 3 adults will reach their peak numbers around June 2nd.  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.