Abstract
Abstract Seven treatments were tested for efficacy against bollworm/tobacco budworm in cotton planted 18 May. Treatments were arranged in randomized complete blocks replicated 4 times (6.7 (2 rows) × 50 ft). Application was with a compressed air spray system mounted on a John Deere, model 6000 high clearance sprayer (5.5 mph, 7.3 gal/acre, 42 psi, Conejet TX-8 nozzle tips). The cotton crop was planted in a 2 × 1 skip row pattern. Treatments were arranged so that the treated rows in each plot were bordered on each side by 2 untreated planted rows and 1 untreated skip row. Bollworm/tobacco budworm larval infestation and damage observations were made by examination of the top 6 inches (terminal area) of 25 plants per plot for larvae, and examination of 25 squares from the terminal area for larval damage. Data are converted to larvae per 100 terminals and percent larval damaged squares. Since bollworm/tobacco budworm infestations in 1990 were atypically low during most of the season, only pretreatment and posttreatment means for larvae in terminals and larval damaged squares for the first application date, 10 Aug, are presented.
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