Twenty-one sites reporting this week with five sites reporting European corn borer (ECB)-E and four with ECB-Z. Corn earworm (CEW) was found at four sites, with numbers at one site in the range indicating a need for a six-day spray interval, please see the table below for the recommended spray schedule for CEW. Five sites reported fall armyworm (FAW). The Western bean cutworm (WBC) flight has started with four sites reporting their first trap catches.

I scouted three separate fields today all below threshold. Each field is different and even if trap numbers are low and one field scouts below threshold, it is still important to scout fields that are in different locations. Moth population can be very different between fields. Remember that the threshold is 5% for silking corn and 15% for tassel emerging corn.

I also observed corn leaf aphids in one of the fields. While scouting for worm pests it is important to also note other pests. The threshold for corn leaf aphid at tassel emergence is 50% of plants with more than 20 aphids. The scouting form contains a column to keep track of corn leaf aphids as well as other pests. If you would like to download a scouting form to use in the field please go to Sweet corn scouting form (pdf). If you have questions on how to use the form please view the scouting video or email me at mez4@cornell.edu .