Abstract
Abstract A full season study was conducted at the Plant Sci. Res. Farm of the Mississippi Agriculture and Forestry Experiment Station, Mississippi State, MS. Plots were planted to ‘Stoneville 825’ on 7 Jun. All treatments were replicated 4 times and arranged in a randomized complete block design. Each plot was 4 rows (38-inch rows) by 50 ft with 2 buffer rows between plots. Insecticides were applied with a boom-type sprayer calibrated to deliver 6.1 gal/acre total volume at 30 psi through two TX-4 nozzles per row. Treatments were initiated 2 Aug but were discontinued due to rain 4 Aug and were not started again until 14 Aug at which time they were applied at the intervals shown in the data table until 20 Aug. All plots were sprayed for boll weevil suppression on 30 Aug, 12, 20, and 28 Sep and 3 Oct with Guthion 2L (0.25 lb (AI)/acre). Insect populations and plant damage were monitored on 1, 16, and 24 Aug by making 5-ft whole plant counts in each plot. Yield data were taken 21 Nov by mechanically harvesting the center 2 rows of each plot.
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