Cutworm Control in Sugarbeets, Mayville, North Dakota, 1973

Insecticides were screened in a randomized-complete block test with 5 replicates. Soil in the plots was a silty loam with a pH of approximately 7 and 4% organic matter. The plots were planted April 27 and consisted of six 60 ft rows spaced 22 in . apart. Treatments were applied in 7 in . bands over or between the 4 center rows at 3 mph on May 30. Beets were in the 4-6 leaf stage when the treatments were applied. Liquid treatments were applied in 18 gals water/acre with 8002E nozzles at 40 psi. Weather conditions were generally good for beet growth and insecticide application. Weather data are missing. However, measurable rain fell after the treatments were applied. Data consisted of differences between plant counts taken May 29 (pretreatment) and June 6 (post-treatment) from the entire length of rows 2 and 3 (from the left) in each plot. The data were analyzed by analysis of variance and Duncan's new multiple range test. Cutworms were 1/4 to 1/2 grown when the treatments were applied, and the infestation averaged 3 larvae/sq ft.