Foliar Sprays to Control Ear Invading Insects in Sweet Corn, 1992

Abstract

Abstract ‘NK-199’ sweet corn was planted in 4-row plots 100 ft. in length on 15 Jun ’92. Distance between rows was 3 ft. Distance between plants within the row was 8 inches. Plots consisted of 4 treatment rows with the center 2 rows serving as record rows. Treatment plots were replicated 4 times and arranged in a randomized complete block design. Sprays were applied with an International Harvester 770 Hi-Clear sprayer. The spray boom was adjusted to spray the silk area with each row being covered by 4 nozzles. The sprayer was equipped to treat 4 rows. All treatments were mixed in 10 gallons of water and applied at the rate of 25 gal/acre with 50 psi. Spray treatments were applied at 25% silk on 4, 8, and 11 Aug. At harvest (21 Aug), 50 ears from the center 2 rows of each plot were husked and evaluated for worm damage as fresh-market (clean ears, no damage evident), processing (evidence of tip feeding but less than 3.6 cm tip damage), and culls (tip damage beyond 3.6 cm to the side and/or bottom). All worms found within the husk or ear were identified. The soil type was a Norfolk “A” loamy sand.