It happens at least once or twice every year; someone finds a brilliant metallic green beetle in a corn or soybean field and asks if it is a pest. The dogbane beetle is fairly large for an Iowa beetle, about 3/8-1/2 inch in length, but it feeds only on dogbane and milkweed. The larvae feed on the roots of these two plants; therefore, this insect is fairly common along roadsides, in pastures, and grassy filter strips in fields where these plants grow.
Iowa State University
Rice, Marlin E., "Dogbane beetles are not pests" (2003). Integrated Crop Management News. 1628.
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