Economic thresholds have not been established for this insect on potatoes. However, as a general rule, no controls should be needed until you find 1- 2 beetles per sweep. European corn borer activity remains below 1 moth per night throughout the state. If you are unable to scout for infested terminals, the first corn borer spray should be applied 7 to 10 days after trap catches reach 10 moths per night in your area. Despite a relatively cool spring, planting has proceeded fairly well.
Potatoes are essentially complete.
Sweet Corn plantings have gone in the ground well, but cool nights have slowed the schedule for processing sweet corn plantings. Pickle plantings began on Wednesday, May 5. Transplanting of melons, cantaloupes, tomatoes, and other crops have begun. Seed corn maggot damage on melons has been reported already. This is generally confirmed by plastic suppliers and applicators.