Nymphs are wingless. Both adults and nymphs will run backwards or sideways rapidly. Large numbers of adults may appear early in the season. Nymphs usually complete their growth on the leaf where they hatched, feeding on the underside of the leaf. Damage by leafhoppers is referred to as hopper-burn.
Foliage becomes dwarfed, crinkled, and curled.
Small triangular brown areas appear at the tips of leaves, gradually spreading around the entire leaf margin. The threshold for basing spray decisions is when an average of one leafhopper per trifoliate leaf is found. Do not let infestations and damage progress to the point that yellowing of foliage is easily detected. The bean aphid has not been a major pest in North Dakota, though it can be found. They feed along stems and the underside of leaves.