EFFECT OF VARIOUS CHEMIGATION METHODOLOGIES ON SUPPRESSION OF THE FALL ARMYWORM (LEPIDOPTERA, NOCTUIDAE) IN CORN

Studies were conducted in Tifton, Georgia during 1989 to compare the effectiveness of center-pivot irrigation sprinkler packages and various formulations of insecticides for the control of fall armyworm, Spodoptera frugiperda (J. E. Smith), infesting corn. Chemigation with Whirl-jet (E53) sprinklers provided better control of the pest than impact sprinklers or a Pass system. Chemigation with whirl-jet sprinklers controlled fall armyworm as well as a conventional hi-clearance sprayer. Asana XL 0.66 EC + oil chemigated with an irrigation simulator provided the most consistent control of fall armyworm larvae in whorl stage corn when compared with Asana XL + water, Lorsban 4E + oil, Lorsban 4E + water, Lorsban 6 (tech.) + oil, Larvin 3.2 + oil, and Larvin 3.2 + water. All tested materials resulted in significant reductions in fall armyworm damage to the whorls of corn.