Black locust (Robinia)-Aphid

Cowpea aphid (Aphis craccivora)

Pest description and damage These aphids vary in color progressing from light greenish-gray through darkening shades of green to shiny black as they molt. The four molts leave abundant white cast skins among the living aphids and honeydew. Feeding results in puckering, stunting, and curling leaves and pods, covered with copious sticky honeydew and sooty mold.

Biology and life history Overwintering eggs hatch on alternate hosts such as alfalfa in spring. Shortly after, alates (winged females) fly to black locust and other hosts. Parthenogenetic females lay over 100 eggs and there may be up to 20 generations.

For biology, life history, monitoring and management

See "Aphid" in:

Management-chemical control

See Table 1 in: