Control of Corn Earworm on Sweet Corn in Southern California1

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Abstract
Comparisons were made of 115 insecticide treatments on 404 sweet corn plots for control of Heliothis armigera. Insecticides used were: DDT, DDD, toxaphene, difluorodiphenyltrichloroethane, chlordane, methoxy-chlor, ditolyltrichloroethane, pyrethrum, styrene dibromide, parathion, and mineral oils. Applications were made as dusts, as sprays, as aerosols, and as solutions, by an oil injection method. 1% DDT and 1% DDD in mineral oil applied by the aerosol or injection method gave the best control. Single dust applications were ineffective, but poor control was probably due to inadequate number of applications. Sprays gave some control but were inferior to aerosol applications. Water emulsions were inferior to oil solutions. With the aerosol machine a 2-inch distance between the nozzle and the tip of the corn ear, was the most effective. The injection method was slightly more effective than the aerosol, but the aerosol treatment (6-12* gal./acre) was 4 times as rapid. Aerosol or injection applications of high concns. of oil should not be made until after the corn is pollinated. No DDT residues were found on the edible portion of the ear of corn, but 3-137 ppm. were found on the ear refuse,.

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