Wingless female aphids known as stem-mothers hatch about late March. These stem-mothers move out to the opening buds and leaves and feed until fully grown. When grown, they give birth to living young without mating. The young are likewise all females and later, they too give birth to living young. Each black pecan aphid female reproduces for about 10 days and gives birth to about 35 young.
Winged females develop during some of the generations.
These winged aphids fly to other parts of the same tree or to different trees. In late fall, winged male and wingless female aphids are produced. They mate and the wingless females lay fertilized overwintering eggs on the tree. Twenty to 30 successive aphid generations may occur during the year depending upon the season. Aphids are present in orchards whenever pecans are in leaf.