We are seeing severe armyworm infestations in the field. Moth numbers have stayed relatively constant in a few locations, still on the increase in Sutter and Yolo counties. This means that egg laying may continue and we may have more worms coming up.
I have gotten several reports of pyrethroids not controlling worms. Dimilin (diflubenzuron) has been working well. However, remember that Dimilin has an 80 day pre-harvest interval. Intrepid (methoxyfenozide) received a Secion 18 today and can now be used.
The infestation is not over yet, so don't stop scouting. If you detect small worms, consider a treatment. Armyworms get their name form the fact that they move "like an army", in large numbers all at once. Worms may move from areas with severe infestations to unaffected areas of the field.
Here's a few of the pics I have received from several areas of Colusa, Glenn and Butte counties.
