Abstract
Cotton was planted on 3 May in conventional tillage on an Acock very fine sandy loam soil at the Upper Coastal Plain Research Station near Rocky Mount, NC. Plots were 4 rows by 40 ft in a RCB design with 4 replications. All four rows treated with the insecticides indicated in the table, with the exception of the Bollgard II variety, which was untreated. The foliar treatments were made one 3 and 14 Aug with a CO2-powered backpack sprayer calibrated to deliver 8.0 gpa at 50 psi with a single TX-8 Spraying Systems nozzle per row. The initial rate of the experimental insecticide DPX-E2Y45 1.67SC was the same, but differed between the three treatments in the second application. On 7 and 21 Aug and on 6 Sep, 25 randomly selected bolls per plot (100 per treatment) were examined for bollworm injury. The center 2 rows of each plot were harvested with 2-row John Deere mechanical harvester on 20 Oct. All field data were entered into Gylling’s ARM 6.2 software and analyzed via ANOVA with LSD (P = 0.05) values shown in the table.
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