Rootworm Control in Field Corn, 1979

Corn was planted May 10 in Montgomery County, VA., to evaluate planting time applications of eight granular insecticides for the control of corn rootworm larvae. Treatments were applied in a 7-in band over the row in front of the presswheel. The experiment was arranged in a randomized complete block design with four replications. Plots for each treatment consisted of 4 x 50 ft rows on 36-in centers. Root damage was determined by digging and washing 6 plants on July 11 from each row. Treatments were evaluated by root damage ratings (Iowa 1-6 system). Data was analyzed using Duncan’s Multiple Range Test. The soil type was silt loam. The field had a history of Furadan use. Rainfall for May, June and July was above normal. Air temperature for the period was below normal.