Abstract
Abstract Two timings of corn rootworm insecticides were evaluated >n a Hagerstown silt loam soil near Rocksprings, Pa. Three common soil insecticides were used in the test. Each insecticide was applied at planting and at cultivation at 1 lb (AI)/acre. In addition, Counter 15G was applied at 2 lbs (AI)/acre. A randomized complete block design with 6 replications of 8 treatments was used. Plots were 40 ft long by 6 rows wide. The at-planting time applications were applied using a Max Emerge John Deere 7000® corn planter on 18 May. At cultivation treatments were applied on 26 Jun using a Noble® granular applicator mounted on bicycle wheels. Both at planting and at cultivation applications were applied in 7-inch bands over the row. The corn was planted on 18 May in 30-inch rows at 27,000 plants/acre. In 1987, rainfall measured 2.75, 2.82, 2.84, and 3.88 inches for May, June, July, and August, respectively. On 17 Jul, 5 corn plants were dug per plot and the roots rated for damage using the Iowa six-category rating system (1, no damage to 6, 3 nodes cut). Corn was harvested on 3 Nov and yield measured from the middle 3 rows of each plot.
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