Foliar Sprays to Control Ear Invading Insects in Sweet Corn, 1995

Abstract

Abstract ‘Nk-199’ sweet corn was planted in 4-row plots 100 ft in length on 1 Jun ’95. Distance between rows was 3 ft. Distance between plants within the row was 8 inches. The soil type was Norfolk “A” loamy sand. Plots consisted of 4 treatment rows with the center 2 rows serving as record rows. Plots were replicated 4 times in a RCB 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 30% silk 21 Jul, 25 Jul and 29 Jul. At harvest (4 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.