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->Home > scouting > scnetwork > scnetwork07 Sweet Corn Pheromone Trap Network for Western New York, 2007
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This is a seasonal scouting report giving growers in the Western New York area information on the presence of sweet corn pests and recommendations on scouting and thresholds. The report is written by Abby Seaman, NYS IPM's Area Extension Educator for Vegetables. For 9/25/07 This is the last week for the trap network report. Many thanks to everyone who contributes to the network. It's very much a collaborative effort! European corn borer counts remain low at all locations. Corn earworm numbers remain fairly high at many locations, still in the 4-5 day spray interval range, depending on temperatures. Earworm larvae are being found in fields that had 3-4 day spray intervals. As fields are harvested and only a few remain, pressure will increase in fields with drying silks, which would have been less attractive when younger fields were still available. Fall armyworm counts have dropped into the single digits at most locations. Once CEW are being caught in higher numbers, insecticide applications in silk stage fields should be determined by CEW trap catches. The recommended spray intervals for CEW should be adequate for ECB and FAW control. Because CEW lay their eggs directly on the silk, and eggs are difficult to find in the field unless the population is VERY high, we rely on pheromone trap catches rather than scouting to make CEW management decisions. It is most important to adhere to the recommended spray intervals when the field is in the green silk stage. The chart below indicates recommended spray intervals during the silk stage for a range of trap catches: Average CEW Pheromone Trap Catches
Add one day to the recommended spray interval if daily maximum temperatures are less than 80° F for the previous 2-3 days.
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