University of California Rice On-line
University of California Rice On-line
University of California Rice On-line
University of California
University of California Rice On-line

Armyworm Monitoring

2019 Armyworm Trapping

Update August 14

By this time last year, we were seeing the peak of moth flight, with about 18 true armyworm moths per night, and almost no western yellostriped armyworm moths. This year, true armyworm moths are below 10 per night, except for a couple of locations in Glenn County. If we are going to experience an increase in flight, it might come in the next two weeks. 

I visited fields of early headed rice in Butte and Glenn counties, and I could not find worms or found very few worms. I would say late planted rice may still be at risk, specially if we see the flight materialize. 

Western yellowstriped armyworm remains a mystery to me. The numbers we have been trapping are variable, but we are seeing more than last year. However, I do not see them in the field. 

I'd say we have two more weeks to worry about, and if numbers are still low, we may be out of the woods.

Traps Aug 14_Page_1
Traps Aug 14_Page_2
Traps Aug 14_Page_3
Traps Aug 14_Page_4

Thanks to Corteva Agriscience for helping fund the 2019 armyworm trapping network.

I'm using the FarmDog app to keep track of sampling sites and moth counts.

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