Abstract
Abstract Silver Queen variety sweet corn was planted 14 May on the University of Delaware farm in Newark, DE. The corn was planted in a fallow field containing various annual grasses and leguminous weeds using a Buffalo1'’ no-till planter. Standard no-till weed control and fertilization practices were followed. Plots consisted of 4 rows, 25 ft long on 30 inch centers. Six insecticide treatments, replicated 4 times, were arranged in a randomized complete block design. Both the Lorsban 15G and Counter 15G treatments were applied as a “T” band at planting. The Aastar* 15G treatment was banded over the row by hand using a shaker can just after planting. The spray treatments were applied 24 h after planting using a C02 propelled backpack sprayer. Three R and D Sprayer, Inc. HC4 hollow cone nozzles were mounted on a 30 inch hand held boom and delivered a total of 26.4 gal per acre at 40 psi in a uniform spray swath. Steel barriers 6 ft x 6 ft x 6 inches high were placed in the approximate center of each plot at the 2-3 leaf stage. Each barrier enclosed two rows and was sunk into the ground 1 inch to prevent subsurface escape of cutworms. Each barrier also had a 1 inch horizontal lip attached along the inside top to deter escape of the cutworms. On 5 Jun 40 cutworms were released in each barrier. Twenty worms were placed along the outside of the two rows. A furrow Vt inch wide and Vi inch deep was dug between the 2 rows and 20 cutworms were placed in it and covered lightly with soil. Cut plant counts were taken on 5 (prerelease), 6, 10, and 13 Jun. During each observation, cut plants were marked with smaller mixer straws. For consistency, a marked plant was still considered cut even though it recovered in later observations.
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