Due to the complex nature of corn seed production and the high price of the product in comparison to field corn, seed corn is considered a high-value crop. Consequently, very low levels of European corn borer infestation can cause significant economic losses. This emphasizes the need for an effective scouting program for seed corn production. The following applies to select lines of corn (usually inbreds) grown as parents for producing hybrid seed for market. For whorl-stage seed corn, treat when percent of infested plants exceeds 2 percent for corn that is valued at $20 per unit (80,000 kernels per unit) and when it exceeds 3 percent for corn valued at $10 per unit. For corn that has reached or is just past pollination stage, treat when the percent of plants with egg masses or live European corn borer larvae exceeds 12 percent for corn valued at $20 per unit and when it exceeds 18 percent for corn valued at $10 per unit (A. C. Sayers and
M. K. Bergman).