Table 13.   Stalk Borer Economic Thresholds

Percent infested plants at four corn prices
Leaf Stage $2/bu $3/bu $4/bu $5/bu
1 10%  7% 5% 4%
2 12%  8% 6% 5%
3 15% 10% 7% 6%
4 16% 11% 8% 6%
5 17% 12% 9% 7%
6 34% 23%  17% 14%
7 100% 100% 100% 100%

These economic injury levels are based on $13/acre control costs and 80% control with an insecticide. (From Iowa State University IPM Newsletter)

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