A field study was conducted during 1990 to evaluate the effectiveness of chemigation for management of Helicoverpa zea (Boddie) and Heliothis virescens (Fabricius) attacking cotton on the Georgia coastal plain. Chemigation of cypermethrin proved as effective in controlling the pest complex as the application of cypermethrin with a hi-clearance tractor-mounted sprayer. The use of Ammo^® 2.5 EC (0.025 lb ai/ac) + Orchex^® 796 petroleum oil (non-EC) resulted in the most consistent reduction in worm-damaged squares. Chemigation of similar rates of Ammo 2.5 + water and Ammo Tech. + oil resulted in the number of damaged squares being similar to those recorded from the conventionally sprayed (Ammo 2.5 EC) plots. Cotton yields in all chemigation treatments were significantly greater than yields in the conventionally treated and untreated plots.