Sugarbeet Root Maggot Control, St. Thomas, North Dakota, 1974

Insecticide treatments were replicated seven times in a randomized-complete block test. The soil was mostly silty clay loam with a pH of approximately 7 and 5-8% organic matter. Plots consisted of four 60 ft rows, and were planted June 3. Insecticides were applied to all four rows at 3 mph. Treatments were made in the furrow, in 7 in. bands over the rows at planting, and 7 in . bands over the rows at post-fly emergence (June 24). Fly emergence reached the peak on June 25. The banded treatments were lightly incorporated into the soil with drag chains (1 3/4 in . links). Liquid materials were applied in 18 gal. water with 8002E nozzles at 40 psi. Weather conditions were favorable for insecticide application and for good beet growth later in the season. Very little rain fell after the materials were applied. Data consisted of yields from 30 f t . of beets from row 2 (from the left) in each plot. The data was transformed by x , and was analyzed by analysis of variance and Duncan's new multiple range test. The functional maggot infestation (based on the amount of damage to untreated beets) indicates that there were sufficient maggots to provide satisfactory data. The infestation was light to moderate. The ave damage rating was 2.69 on a scale of 1 (no damage) to 5 (severe damage).