Efficacy of Selected Insecticides Against Fall Armyworm, European Corn Borer and Boll Worm on Cotton in Southern North Carolina, 1993

Cotton was planted in a Wagram loamy sand on 10 May near Richlands, NC. The fertility and weed management programs followed NCSU recommendations with 0.6 lb (AI)/acre Temik 15G applied in furrow at planting. Plot size was 6 rows (38 inch centers) × 50 ft with 10 ft alleys. A RCBD was used with 4 replicates. Treatments were applied via a backpack-type CO2-pressurized sprayer calibrated to deliver 8 gal total volume per acre at 50 psi with a single TX-8 Spraying Systems® nozzle per row. Initial treatment was based upon exceeding a threshold of 10 eggs per 100 terminals, with the 2nd application 5 d later. The 3rd and 4th applications were triggered by meeting a larval threshold of 3 percent BW or FAW in fruit. Application dates were 22 and 27 Jul and 10 and 19 Aug. Twenty-five bolls per plot were inspected for live caterpillars and damage on 17 Aug and 15 Sep. Yields were picked with a 1 row John Deere mechanical harvester. Insect and yield data were subjected to ANOVA and DMRT.