Control should be applied within 1 week of when the first adult flies are trapped. Diazinon and Sevin are also labeled for maggot control. Black Peach Aphid. Unlike other aphids, the black peach aphid feeds below ground on peach roots and large populations can severely debilitate young trees. In spring, many of these overwintering root feeders emerge to establish colonies on the buds.
Populations can increase rapidly as the winged forms spread the infestation throughout the orchard.
In midsummer, aphids disperse downward through soil cracks to peach roots where they spend the winter. Once aphids become established on the roots, control is difficult. Control on twigs and leaves is best achieved with either Lannate or Thiodan applied early in the season before leaves become deformed. The most effective control of the black peach aphid is to prevent its introduction into the orchard on the roots of nursery stock. Dipping the roots of nursery trees in an endosulfan solution for controling peach tree borer should also kill black peach aphids.