European corn borer are being caught this week at less than half the locations reporting, and numbers are mostly in the low single digits.  Corn earworm are being caught at most of the locations reporting this week, and are in numbers high enough to drive the spray schedule at over half the sites (see the table below).  Fall armyworm were caught in low numbers at just under half the trapping locations, and western bean cutworm are being caught in very low numbers at only three locations this week.

Where CEW are being caught in high enough numbers to drive the spray schedule, the other worm pests should also be controlled.  Where FAW are being caught, a tassel emergence scout is still a good idea, as some years we see heavy FAW infestations in the emerging tassels in late plantings that may have time to get into developing ears before silk sprays for CEW.  At locations where CEW numbers are still low, scout tassel emergence and silk stage fields for ECB and FAW larvae.  Use a threshold of 15% infested plants in tassel emergence stage fields and 5% in silk stage fields.

Recommended spray intervals based on corn earworm trap catches