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Corn Rootworm Larval Control in Field Corn, 1984


 Planting-time applications of soil insecticides were evaluated for their perfor-mance against corn rootworm larvae at 3 locations in Minnesota. The experimental design of each test was a randomized complete block design with 4 replications. Plots measured 4 rows x 55 ft. Granular insecticides were applied in a 7-inch band over the center 2 rows of each plot using modified Noble metering units and were lightly incorporated. Fields were planted on 11, 17, and 22 May at Morris, Waseca, and Lamberton, respectively. Rootworm feeding damage was rated on 5 washed roots per plot using the Iowa 1 to 6 scale (1 = no feeding, 6 = 3 nodes of roots completely destroyed). Damage ratings were made on 26 Jul, 1 Aug and 2 Aug at Waseca, Morris, and Lamberton, respectively. Yields were determined by machine-harvesting 1/290 acre and converting yields to No. 2 shelled corn at 15.5% moisture. Rainfall from planting to 1 Jul exceeded normal levels at all three sites, but particularly at Lamberton. Cumulative rainfall was recorded at 7.26, 8.51, and 7.33 inches compared to normal levels of 6.08, 4.65, and 6.62 inches at Morris, Lamberton, and Waseca, respectively.