Armyworm Monitoring

2026 Armyworm Monitoring Update

Week of August 10

Numbers have increased slightly, mostly in the west side of the Valley. However, in most locations, moth numbers remain low. We have not detected any worms in the field yet.

Line graph: 2026 Sacramento Valley moth captures peaking mid‑June (~50) then declining.

Armyworm trapping results by location

 

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Funding for the trapping is provided by the Rice Research Board and Corteva Agriscience.