Control of Soybean Loopers on Soybeans in Alabama, 1985

Abstract

Abstract The test was conducted on soybeans planted at the Plant Breeding Unit of Auburn University, Tallassee, AL. Eleven treatments and an untreated were replicated 4 times in a randomized complete block design. Each plot was 4 rows wide (40-inch row spacing) and 40 ft long. Plots were separated by a 2-row mowed alley, and replicates were separated by a 10-ft mowed alley. Treatments were applied on 4 Sep, at soybean growth stage R5, with a tractor-mounted boom sprayer equipped with 3 TX-3 hollow cone nozzles per row. The sprayer was operated at 40 psi, delivering 8.9 gal/acre. Insect populations were sampled by placing a standard 3-ft beat sheet between the rows and beating the plants of both rows. Soybean looper larvae were counted and recorded as small (<0.2 inch) medium (0.2 to 0.5 inch), and large (>.5 inch). Three samples from the middle 2 rows of each plot were taken at 1 day pretreatment and 2, 5, and 12 days posttreatment.