Abstract
Abstract A full season study was conducted at the Plant Sci. Res. Farm of the Miss. Agric. and For. Exp. St., Mississippi State, to determine the efficacy of reduced rates of pyrethroids for control of Heliothis sp. larvae on cotton. Plots were planted to ‘Stoneville 213’ on 27 May. All treatments were replicated four times and arranged a randomized complete block design. Each plot was four rows (3.66 m) by 17.06 m with two buffer rows between plots. Insecticides were applied with a boom-type sprayer calibrated to deliver 6.6 gal/acre total volume at 30 lb/in2 through two TX-4 nozzles per row. Applications were made at about weekly intervals on 27 July, 1, 9, & 16 Aug. All plots were sprayed for boll weevil suppression on 30 June, 8, 18, 27, & 29 July, 10, 22 & 24 Aug. with Guthion (0.25 lb(AI)/acre). Insect populations and plant damage were monitored on 4 and 9 Aug. by randomly examining 25 squares and 25 terminals per plot. Yield data were taken on 10 Nov. by mechanically harvesting the center two rows of each plot.
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