Abstract
Abstract The relative efficacy of 6 insecticide treatments was evaluated at Delta Branch Experiment Station, Stoneville, MS, in a randomized complete block design with 4 replications. Treatments were applied by high clearance tractors with 2 Teejet 4X nozzles/row aplying 6.5 gal/acre. Spray applications were begun at the 4th true leaf stage and reapplied on schedule for 6 applications ending after the 9 Jul application. Two treatments were included as maintenance treatments and were applied only once. Plants were scouted weekly by the whole plant method for Heliothis spp., boll weevil, plant bugs, and related damage. Plots were 4 rows (38-inch centers) by 50 ft with 2 untreated rows between plots. All plots were oversprayed with Lorsban at 0.05 lb/acre 15 Jul for aphid control. Aphids were scouted for 11 and 25 Jul in lower middle and upper regions of the plants by estimating aphids/leaf as 0, 1-5, 6-15, 16-25, and >25 for 10 leaves per replicate. Mean aphids per leaf were calculated from field data. There were no statistical differences in aphid numbers between levels within treatments and data were pooled. A center row of each plot was harvested mechanically 19 Sep.
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