Colorado potato beetle
Department of Entomology, University of Minnesota
Size: 3/8 inch long
Where/When: Feeds on potato as well as eggplant, tomato, pepper, and related plants. Adults are active from June through September.
Significance: Chews leaves; potatoes can tolerate up to 30% defoliation when they are in a vegetative stage but can only tolerate 10% defoliation when tuber are bulking up. Severe defoliation can reduce plant vigor, size, and yield.