Pest description and crop damage Small yellowish insects < 1 mm long. Feeding on undersides of leaves injures cells. Damage appears as stippling, silvering, and/or yellowing of leaves. Generally, thrips are a localized problem in drought-stressed areas of fields or portions of fields adjacent to a crop just harvested. Seldom a problem requiring insecticide.
Avoid water stress with proper irrigation regime.
- Beauveria bassiana (Mycotrol) Check each label for application rate. PHI 0 days. REI 4 hr. Most effective when used at first detection. May require 3 to 5 intervals. Some formulations are OMRI-listed for organic use.
- Chromobacterium subtsugae (Grandevo) at 0.6 to 0.9 lb ai/A. PHI 0 days. REI 4 hr. May be applied by chemigation. Apply in at least 10 gal water/A. OMRI-listed for organic use.
- spinetoram (Radiant SC) at 0.031 to 0.094 lb ai/A. PHI 7 days. REI 4 hr. Retreatment interval 4 days. Do not apply more than 0.305 lb ai/A per crop or make more than 4 applications per year. Suppression only. Do not make more than 2 successive applications of this or other group 5 insecticides (spinetoram and spinosad).
- spinosad (Success, Entrust SC) at 0.062 to 0.156 lb ai/A. PHI 7 days. REI 4 hr. Retreatment interval 7 days. Do not exceed 0.45 lb ai/A per crop year, make more than four applications per calendar year or more than three applications per crop. Suppression only. Do not make more than 2 successive applications of this or other group 5 insecticides (spinetoram and spinosad). Entrust SC is OMRI-listed for organic use.