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Abstract
Farmers reported that 49.3 million pounds (a.i.) of pesticides were applied to field corn in the Lake States during 1980. This consisted of 43.4 million pounds (a.i.) of herbicides and 5.9 million pounds (a.i.) of insecticides. Pesticide acre—treatments totaled 26.3 million and consisted of 16 million with single material herbicides, 4.7 million with herbicide mixes, and 5.6 million with insecticides. The primary herbicides were alachlor, atrazine, cyanazine, and 2,4—D. The major insecticides were carbofuran, fonofos, phorate, and terbufos. Herbicides were applied primarily to control cocklebur, foxtail, and quackgrass infestations. Most insecticides were applied for corn rootworm larvae control. Coefficients of variation were computed for acres of field corn treated with specific pesticide materials.