Sugarbeet Root Maggdt Control, St. Thomas, North Dakota, 1971

Abstract

Abstract Insecticide treatments were replicated 4 times in randomized - complete block rests at each of 3 locations. The soil in the plots ranged from a silty loam to a silty clay loam. All had a pH of approximately 7 and 5-8% organic matter. Beets were planted May 7, Hand 19. Pre-fly emergence treatments were applied May 11, 14 and 21, and post-fly emergence treatments were applied June 7, 14 and 15. Peak fly emergence occurred June 12. Plots consisted of six 100 ft rows spaced 22 inches apart. The insecticides were applied in 7 inch bands over each of the 4 center rows in the plots. Liquid materials were applied in 18 gals of water/acre with 8002E nozzles at 40 psi. Applications were made at 3 mph. The insecticides were lightly Incor- porated into the soil with drag chains (1 3/4 in. links) during application. Weather conditions during the investigations were generally good J for beet growth and insecticide application. Significant rain fell after treatments were applied. Data consisted of yields from 30 ft from row j 3 (from the left) in each plot at harvest. All observations were transformed byX and analysed by analysis of variance and Duncan's new multiple range test. Although there was variation in maggot numbers from plot to plot and within plots, it was assumed that the infestations J were of sufficient numbers to provide satisfactory data. The ave from 384 beets from untreated rows was 9.21 maggots/beet.