Insecticidal Control of Regulated Populations of Black Cutworm on Corn11

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Abstract
To assay potential cutworm insecticides, laboratory-reared 4th-instar black cutworms, Agrotis ipsilon (Hufnagel), were used at the rate of 1 larva per plant within aluminum barriers, 4 inches high, placed around 5 corn plants in field plots. Granular insecticides were applied as a 7-inch band over the row after seeding, and sprays were used as postemergence treatments. The cutworms were placed within barriers on all plots the day sprays were applied. Two weeks later, surviving plants were cut at ground level and weighed to provide comparative data on productivity per original plant. Diazinon at 2 lb per acre as granules at planting or 1.6-2.3 lb per acre as a postemergence spray gave as good protection to corn plants as the standard Aldrex® (10% aldrin + 10% parathion) treatment. Carbaryl at approximating 2 lb per acre as a spray was equally good, but such a dosage was unsatisfactory when applied in the form of granules at planting. Granules of Furadan® (2,3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate) at 1 lb or a combination of 0.75 lb of CL-47470 (cyclic propylene (diethoxy-phosphinyl) dithioimidocarbonate) and 0.75 lb of phorate per acre provided protection comparable with the standard.

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