Armyworm

After slow start, Armyworm numbers are on the rise

After slow start, Armyworm numbers are on the rise

By Luis Espino, Rice Farming Systems Advisor, Butte and Glenn Counties

The number of moths trapped went down due to the cold weather. But numbers are coming back up again, mostly due to increases of western yellowstriped armyworm. We are starting the season with much higher number of moths than in previous years. Keep a close eye on early planted rice that is out of the water or if you are draining for stand establishment.

I have asked locally to other advisors to see if there are infestations in other crops, but nothing so far. However, there are western yellowstriped armyworm problems in areas of western Canada. This is a long way away, but is the same area that saw heavy infestations of true armyworm in 2015, the same year our outbreaks started.

Here’s a link to graphs regarding armyworm trapping: http://rice.ucanr.edu/Armyworm_traps/

More Armyworm Stories

Updating the Armyworm Fight

Updating the Armyworm Fight

By Luis Espino, UCCE Rice Farming Systems Advisor

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. 

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2019 Armyworm Trapping

2019 Armyworm Trapping

By Luis Espino, UCCE Rice Farming Systems Advisor

Looks like the number if moths we are catching is staying low, except for a couple of locations. By this time last year, we were averaging 18 moths per night, mostly all true armyworm. This year, we are not catching more than 10 per night, and in some cases the majority are western yellowstriped armyworm. I have not heard of heavy infestations on headed rice yet.

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