Regional trapping of true armyworm (M. unipuncta) in Tillamook county has been ongoing since May. Only 6 of the 15 original monitoring sites remain, but at those sites, we have seen a sharp increase in trap counts.
We know that it is normal for armyworm to have 3 generations per year, which matches the pattern we see here:
This is our first year trapping this species, so these data are invaluable – thanks, Tom!!
Although the traps are in NW Coastal Oregon, it is not unreasonable to assume that activity patterns are similar here in the Valley. More importantly: This recent peak in adult moth trap catches suggests that (larval) armyworm activity THIS FALL is likely.
If there are any grass seed growers out there who haven’t sprayed yet (which I doubt there are), you may want to consider it. Product list here. Or at least hop on the four-wheeler and have a scout around. And remember that insecticides work better on smaller larvae, and by time you see apparent/massive damage, it may be too late for controls to be effective.