Soybean Looper Control on Soybeans, 1975-76

One test (Table 1) was conducted in 1975 at the Auburan University Black Belt Sutstation near Marion Junction, Alabama, using Bragg variety soybeans. Four insecticides at various rates were tested in this experiment. Nine tests (Table 1-5) were conducted in 1976 at the Auburn University Plant Breeding Unit at Tallassee, Alabama, also using Bragg variety soybeans. Several insecticides at various rates were evaluated in these tests. Plots were four rows wide and 37 feet long (1/100 acre) in all tests. A randomized complete block design with 4 replications per treatment was used. Sprays were applied using a CO2 pressurized sprayer delivering 12.5 gallons of insecticidal spray per acre. Counts of live looper larvae were made 24 hours after treatment on most plots. Counts were made on plots treated with Dipel 5 days after treatment; Dintil in treated plots were surveyed at 7 and 14 days post-treatment. Larvae were collected from a total of 12 feet of row from the middle two rows of each plot using the plant-shake ground-cloth method. Mean counts for each treatment were anlayzed using Duncan’s multiple range test to determine differences at P = 0.05.