Abstract
Abstract The current application rate for most corn rootworm (CRW) soil insecticides is approximately 1.0 lb of actual insecticide per acre. Reduced rates (V2 and % of the labeled rates) of selected CRW insecticides were included in our regular insecticide evaluations to compare their effectiveness with the labeled rates. Experiments were conducted from 1987 through 1991 at several research locations. Soil insecticides were applied at planting time in-furrow or in a 7-inch band ahead of the firming wheels and incorporated into the soil. The experimental designs were randomized complete block with 4 replications. Each treatment was applied to a single 100- ft row; rows were 30 inches apart. Insecticides were metered through Noble units mounted on each of the planter units 0ohn Deere, 7000 series, 4-row Max-Emerge planter). Five roots were evaluated for damage in each plot using the Iowa State 1-6 scale. Stand counts were determined by recording the number of plants per 17.4 linear ft of row.
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