Armyworm

Armyworm Monitoring is underway

Armyworm Monitoring is underway

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

The armyworm monitoring season has started. The first traps were set on April 19, and two more sites were set up on April 30. More traps will be set up in the following weeks as growers finish their ground work and get ready for planting.

Interestingly, the first set of traps caught an unusual high number of western yellowstriped armyworm moths, about 20 per night for the last 10 days. It is not clear what this will mean for rice, but we will monitor closely.

Like last year, the trap numbers will be updated on the UC Rice On-line website once more sites are established.

More Armyworm Stories

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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