Early defoliation by this pest can affect the nut crop for that yea and the nut set in the subsequent year. It also makes the tree more susceptible to winter injury. The black pecan aphid is the only black aphid that attacks pecan foliage. The adult may be various shades of green or black. Nymphs tend to be lighter in color than the adults, especially in spring when the first through fourth instars have little dark pigment.
Antennae are pale yellow with small amounts of black on several segments.
Eyes are dark red and cornicles are short. Ornamental and Lawn Pest Control .