Adults are lemon to copper colored, oval in shape, and 1/4 inch long with 16 black spots on back (wings). Larvae are orange to yellow with fuzz or spines and may be 1/3 inch long. Eggs are yellow and laid in masses. Pupae are attached to plant and are yellow to orange, depending on age.
Adults hibernate in protected places and first appear on bean plants during April and May. The yellowish eggs are laid in large clusters on the leaves; larvae feed on undersurface of leaves and pupate on the plants. Young adults are light lemon-colored. Several generations occur each season.
