Selected Insecticides for Corn Earworm Control in ‘Holladay’ Soybean in Virginia, 1994

Efficacy of selected insecticides, with and without adjuvants, was evaluated against CEW in soybean. Double-crop ‘Holladay’ soybean was planted in 15-inch rows on 29 Jun. Treatments were applied on 31 Aug with water using a CO2 pressurized backpack sprayer calibrated to deliver 12.0 gpa at 18 psi through 8002VS fiat fan nozzles spaced 18 inches apart on the spray boom. A randomized complete block design was used with 4 replicates; plots were 10 ft by 30 ft. Treatments were evaluated 1 h before and 2 and 6 DAT by comparing numbers of larvae using a rigid beat cloth sampling technique. Percent pod damage was determined 9 DAT by randomly selecting 3 plants from the center rows of each plot and recording the number of damaged pods. Yield was determined by combining the 3 center rows of each plot (97.5 row ft) using an Almaco small-plot combine. Data were analyzed using ANOVA and LSD statistical procedures.