Abstract
Abstract 'NK-199' sweet corn was planted in 4-row plots 100 ft in length on 11 Jun '91. 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 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 late whorl-early tassel (30 Jul); 50% silk (3 Aug) and 4 days later (7 Aug). At harvest (15 Aug), 30 ears from the center 2 rows of each plot were 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. Dry conditions prevailed during most of the growing season. Insect pressure was moderate.
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