Abstract
Abstract The efficacy of selected Bacillus thuringiensis (Bt) insecticides was evaluated for soybean looper control at the Macon Ridge Branch of the Northeast Research Station near Winnsboro, LA. The test consisted of a randomized block design with 4 replications. Plots were 5 rows (1.02 m centers) by 9.0 m of soybeans in the R5 growth stage planted 18 Jun. Treatments were applied with a tractor mounted boom equipped with a compressed air delivery system calibrated to deliver 93.5 liters/ha at 2.8 kg/cm2 through 2, TX-8 hollow cone nozzles equally spaced per row. Insecticides were applied on 1 Sep and treatments were evaluated at 2 and 7 DAT using 2 samples of 20 sweeps with a standard 38.2 cm diam sweep net. The plots received 3.0 cm rainfall on 2 Sep and a trace amount of rainfall on 3 Sep.
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