Pest description and crop damage Adults are oval, strongly convex beetles with hard wing covers marked with black and yellow stripes running lengthwise along their back. They are about 0.5 inch long and 0.25 inch wide. Larvae are very plump, dark red when young, but become orange as they near maturity. They have two conspicuous rows of black spots along the sides of the body and are about the same size as the adults. Colorado potato beetles feed almost exclusively on plants of the Solanaceae family, i.e., potato, tomato, eggplant, pepper. Adults and larvae can cause great damage to potato foliage.
Biology and life history Colorado potato beetle overwinters as an adult in the soil and emerges in late April and May to lay eggs. Adults lay eggs in masses of 10 to 30 on the undersides of leaves. Eggs hatch in 7 to 10 days, and the larvae begin feeding on the undersides of leaves. Larvae mature in 2 to 3 weeks, drop to the soil, and enter cracks to pupate. Adults emerge in 5 to 10 days, mate, and deposit eggs as before. Larvae of the second generation mature and pupate in the soil. Adults from this generation form the overwintering stage in the soil. A generation can be completed in 30 days.