Doug Wechsler / Chamaemyiid (Chamaemyiidae) fly larva predator on Mealy plum aphid (Hyalopterus pruni) Philadelphia, Pennsylvania, USA French Creek State Park

PREMAPHOTOS / Mass of Mealy plum aphids (Hyalopterus pruni) beneath a plum leaf, UK

Doug Wechsler / Mealy plum aphids (Hyalopterus pruni) with parasitic mites, New Jersey, USA. June.