Abstract
Abstract A cornfield near Estelline, SD, was chosen to evaluate 39 insecticides for control of first-brood ECB larvae. Preapplication counts indicated a uniform infestation of 3rd-or late 2nd instar larvae in >85% of stalks sampled. Three untreated controls were used to compare 19 granular and 20 liquid insecticide treatments arranged in a RCBD with 4 replications. Individual treatment plots consisted of single 22.9 m rows spaced 0.9 m apart. Granules were directed into corn plant whorls using a Gandy 3.5-hp pneumatic applicator mounted on a highboy. Noble metering units attached to a modified 12-volt chaindriven apparatus regulated the amount of granules released into the applicator. Metering units were calibrated on the apparatus prior to insecticide applications. Liquids were applied using a 3-gal CO2 backpack sprayer unit with a single Teejet 8002 nozzle that delivered 20 gpa at 39 psi while travelling 3 mph. Insecticide treatments were applied on 21 and 22 Jul ca. 1 wk prior to tasselling.
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