Abstract
Cotton was planted on 4 May into a Wicham loam soil in 38-inch rows in southeastern North Carolina near Richlands. The fertility and herbicide programs followed extension recommendations for cotton in this region. Temik at 5.0 lb (AI)/acre was used at planting. Plot size was 45 ft x 4 rows with four replications arranged in an RCBD. The early Orthene 97 PE treatment at 0.75 lb (AI)/acre was made on 18 Jul. Additionally, the whole test was oversprayed on 5 Aug with 0.5 lb (AI)/acre Orthene to encourage bollworm survival via destruction of beneficial insects. The remainder of the treatments were made on 8 Aug with a backpack-type, CO2-pressurized sprayer calibrated to deliver 8.0 gpa at 50 psi with a single TX-8 Spray Systems nozzle 18 inches over the row. All treatments were evaluated for boll damage from bollworms and for live bollworms on 21 Aug. Plots were harvested from the middle two rows with a 2-row John Deere 9600 picker on 18 Oct. Seed cotton yields were converted to lint cotton/acre using 40% gin turnout. All data were entered into Gylling’s Pesticide Research Manager 5.0 software and analyzed via ANOVA and LSD (P = 0.05).
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