Abstract
Abstract A winter wheat field near Wall, SD, was chosen for this experiment. Pretreatment counts indicated that the field was naturally infested with an average of 2.1 army cutworms per 2 ft2. The study involved a comparison of 8 insecticides and an untreated check. A RCB with 3 replicates was used. Plots were 36 X 36 ft separated by 3 ft alleys. Insecticide applications were made on 2 Apr using a CO2-propelled backpack canister sprayer system equipped with 8002 flat fan nozzles delivering 20 gal/acre at 29 psi. Live cutworm counts were made 7 DAT to determine insecticide efficacy. A sample consisted of randomly selecting a 2 ft section of wheat within a row, then sifting ca. 2 inches deep through a 6 inch wide swath of soil including, and on either side of the row. A total of 8 samples (2 ft2 each) was taken randomly from each plot. Two samples were taken from each quadrant within a plot. Data were analyzed via SAS GLM procedure and means were compared using DMRT. All insecticide treatments significantly reduced army cutworm levels in comparison to untreated plots. However, no significant differences existed between compounds or application rates.
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