Armyworm

2019 Armyworm Trapping

2019 Armyworm Trapping

Article by Luis Espino, Rice Farming Systems Advisor, Butte and Glenn Counties

The first set of traps were set up on April 19, and more traps are being set up as fields get ready for planting. So far, seven sites have been set up.

As you know, there are two species of armyworms that are found in rice, the true armyworm and the western yellowstriped armyworm.

Surprisingly, western yellowstriped armyworm numbers have been very high in the three sites monitored so far. In the past two years of monitoring, very few of these moths were found this early. We usually get these high numbers at the peak of armyworm flight in late June. True armyworm numbers are low, as expected. I am not sure what the high number of western yellowstriped armyworm means, but it might be a good idea to keep an eye to see what happens in other crops around the rice area.

http://rice.ucanr.edu/armyworm_traps/

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Armyworm Numbers rising

Armyworm Numbers rising

From Luis Espino UCCE Rice Farming Systems Advisor

The number of moths trapped continues to increase. We are finding numerous medium sized worms, maybe second, third, and fourth instars in fields where moth counts are above 30 per night. Worms have moved from levees and borders to basins. This is the time to scout and look closely for defoliation in the upcoming two weeks.

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2019 Armyworm Trapping Update

2019 Armyworm Trapping Update

From Luis Espino UCCE Rice Farming Systems Advisor

The number of true armyworm moths has shot up quite a bit in several locations. True armyworm has been the problem species in the past. Western yellowstriped armyworm moths have been variable, increasing in some locations, decreasing in others, but in general, the numbers are much lower than at the beginning of the season.

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