Abstract
Abstract Efficacy trials against soybean pests were conducted in a conventionally planted grower’s field in the Black Belt region of west-central AL. The field, located on an alluvial sandy-loam terrace of the Alabama River, was surrounded by fields predominately planted in cotton. Four treatments, replicated 4 times in a randomized complete block design, were applied as foliar sprays with a COa pressurized backpack sprayer calibrated to deliver 12 gpa at 40 psi, through 3 TX 6 nozzles per row. Treatments were applied on 15 Sep when soybeans were at the R5 growth stage (pods fully elongated and 1 node with 0.13 inch seed) and when pest populations were high. Plots were 12 rows (30 inch row spacing) × 50 ft in length. Insect population levels were sampled using a standard beat sheet technique. Two 3 ft pretreatment samples were taken per plot as well as four and one 3 ft samples per plot at 3 and 14 days posttreatment, respectively. Larvae were classified as small (instars 1-2), medium (instars 3-4), and large (instars 5 +).
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