Myzus persicae

Myzus persicae, known as the green peach aphid or the peach-potato aphid, is a small green aphid. It is the most significant aphid pest of peach trees, causing decreased growth, shriveling of the leaves and the death of various tissues. It is also hazardous because it acts as a vector for the transport of plant viruses, such as potato virus Y and potato leafroll virus to members of the nightshade/potato family Solanaceae, and various mosaic viruses to many other food crops.

The green peach aphid is found worldwide, although it is less tolerant of colder climates and overwinters through its eggs, laid in trees of the genus Prunus. The aphid also benefits from the presence of greenhouses in these areas.

Originally described by Swiss entomologist Johann Heinrich Sulzer in 1776, its specific name is derived from the Latin genitive persicae "of the peach".

Adult green peach aphids appear in the summer, and are 1.8 to 2.1 mm long; the head and thorax are black, and the abdomen yellow-green with a dark patch on the back. The nymphs are at first greenish, then yellowish in colour; those that become winged females may be pinkish. Wingless adults resemble nymphs and are 1.7 to 2.0 mm long.