Abstract
Abstract The experiment was conducted at the Texas A&M University Agricultural Research and Extension Center at Beaumont. The experimental design was a randomized complete block with 6 treatments and 4 replicates. Each plot was 40 ft by 6 rows (32-inch spacing) with an additional 2 buffer rows between adjacent plots. Soybeans were planted at 10 seeds/linear ft on 25 May and emerged 29 May. Insecticides were applied with a CO2-pressurized hand sprayer at 22.5 psi with 10.8 gal finished spray/acre. The boom had 4 nozzles (TeeJet 800067) spaced 20 inches apart. Plants were in the R5 growth stage at time of application (8 Sep), which coincided with increasing caterpillar populations. Conditions were calm and dry at time of application. Nine ft of row in each plot was sampled with a vertical beat sheet (similar to a ground cloth) one day before and at 1, 4, 7, and 14 DAT. Captured insects were placed in a plastic bag and frozen for later identification and enumeration. At maturity, 20 ft of the middle 2 rows of each plot was harvested for yield, which was adjusted to 13% moisture.
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