Soil Insecticide Tests, 1988

Nineteen corn rootworm soil insecticide treatments were evaluated on a Hagerstown silt loam soil near Rocksprings, Pa. Three commercially available soil insecticides and 2 experimental soil insecticides were used in the test. A randomized complete block design with 6 replicates of 20 treatments was used. All insecticides and rates were applied in furrow and as a T-band applications, with the exception of Furadan 15 G, which was applied only in furrow. Plots were 20 ft long and 2 rows wide. The planting-time applications were applied using a Max Emerge John Deere 7000 corn planter on 23 May. T-Band applications were applied in 7-inch bands over the row, and in-furrow applications were directed into the row in front of the press wheel. The corn was planted 23 May in 30-inch rows, 27,000 plants/acre. In 1988, rainfall measured 5.03, 1.13, 6.18, and 6.14 inches for May, June, July, and August, respectively. Around 1 Aug, 5 corn plants were dug from each plot and the roots were rated for damage using the Iowa 6-category rating system (1, no damage; 6, 3 nodes cut). Corn was harvested on 14 Nov, and yield and number of plants measured from both rows of each plot.