University of California Rice On-line
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Armyworm Monitoring

Armyworm Update Week of June 19

Except for a couple of locations in northern Glenn County (Rd 47 and PP, Hwy 162 and Rd W), number of moths trapped per day increased. Numbers were quite high in the traps at Hwy 45 and White Rd (southern Colusa County), Pelger and Knights Rds (Sutter County) and Hwy 20 and Loma Rica (Yuba County).

I inspected the field at Rd 60 and P in Glenn County today. This area has a history of severe armyworm infestations. I found armyworms ranging from 3rd to 5th instar. Numbers were low (I found 10 worms in about 1 hour of searching, all were near levees and roads). Defoliation was easy to find when observing closely to the canopy, but not worth a treatment. Interestingly, this field has very low numbers in the traps. 

Keep scouting, the next two weeks are critical. Last year, problems started when catches were above 15 moths per day. We are getting to this point in most locations (and past that point in the three traps mentioned earlier). 

Download graphs: Armyworm traps 2018

Map to trap locations: Armyworm traps 2018 

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