There are three types of corn rootworms - Northern, Western, and Southern. Northern adults are tan to green, without distinct stripes or spots. Present mostly in North Central states, also scattered east and south of that region.
Western adults are black and yellow.
Color patterns may vary from distinct stripes to almost black with a yellow tip on the rear of the wing covers. Present in the Plains states, east of the Rocky Mountains. Southern adults, also known as spotted cucumber beetles, vary in color from yellow to green, with 12 black spots on the wing covers. Present in most of the United States east of the Rocky Mountains, in southern Canada and Mexico. Life Cycle Corn rootworms overwinter as eggs in the soil.