After several generations of wingless adults, winged aphids appear during June, and all aphids leave peach trees during June and July. These migrant aphids do not affect peaches because they infest other crops and weeds. Large numbers of green peach aphids may develop on weeds in the groundcover of peach orchards. Aphids return in the fall to peach trees to overwinter. Monitoring and management Trees should be inspected weekly from petal fall until the terminals harden off.
Large trees can tolerate higher levels of infestation.
Currently no available insecticides provide excellent control of green peach aphid. Insecticide treatments may provide initial reduction in the population, but they allow the population to resurge to a higher level than that in untreated trees. Predators such as syrphid fly larvae and ladybird beetles often contribute to biological control of this aphid.