Armyworm

Updating the Armyworm Battle

Updating the Armyworm Battle

By Luis Espino, UCCE Rice Farming Systems Advisor

For the last two weeks the number of true armyworm moths has declined, indicating that at this point there should be very little egg laying going on. In a couple of locations on the west and south part of the valley the number of western yellowstriped armyworm moths has increased. In the past, I have not seen western yellowstriped armyworm be a problem, I have only seen a few worms of this species in rice this year. Just in case, I’m providing graphs with total number of moths (the graphs on the left) and separated by species (on the right).

This year the worm infestation seemed to linger longer than before. It might be related to the slightly cooler conditions we experienced the past couple of weeks. There is always a few smaller worms left behind in the field after the big worms cycle out, but this year it seemed the larger worms stayed in the field longer.

More comments and graphs: 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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