Efficacy of Soil Applied Insecticides for Control of Corn Rootworm Larvae in First-Year Corn Following Soybeans, 1997

A trial was established at Urbana, IL, to evaluate the efficacy of soil applied insecticides in a field of first-year corn following soybeans for control of corn rootworm larvae. Each treatment was applied to a single 65-ft-long row. A RCB designwith four replications was used. Included within each replication were two untreated check plots. Data collected from the untreated plots were averaged for the ANOVA. Granular insecticides applied at planting were metered through computer-controlled SmartBox (SBX) granular applicators or Noble units mounted on each row of the ALMACO four-row precision planter and applied in-furrow or in a 7-inch band ahead of the firming wheels on the planter. Spring tines mounted behind each planter unit were used to incorporate the insecticide. All rates are specified as lb (AI)/acre based on 30-inch row spacing. Lorsban 4 E was applied in a band at planting with a single 80067 nozzle calibrated to deliver 3.3 gpa at 16 psi and 3.0 mph. Liquid treatments of Regent 4 SC 0.13 lb (AI)/acre and Regent 4 SC 0.095 lb (AI)/acre were applied using microtubes directed into the furrow and calibrated to deliver 1.0 gpa at 20 psi and mph.