Abstract
Abstract Sweet corn was planted 11 Jun ’85 so that ear formation coincided with expected peak European corn borer (ECB) activity. Nineteen chemical treatments and 4 stratified untreated checks were replicated in 4 randomized complete blocks 75 ft × 134 rows. Each treatment consisted of 4 rows. Ten border rows were left on the edge of each block. All treatments were applied with a Hagie Hiboy (20 gpa, 3 mph, 25 psi, boom with D3/45 tips on 19 inch centers). The design was to compare rate and interval effects of potential commercial insecticides. Treatments were applied from 25% silk to 15 days before harvest during the second most severe ECB infestation in 30 years, based on light trap records. At harvest, 25 ears from each replicate were evaluated for damage: “clean” (no yellow kernels eaten), “tip”, “side” and “tip & side”. Each ear was assessed for the number of ECB in the small (S), mid (M), or late (L) instar stage.
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