Species Eriosoma lanigerum - Woolly apple aphid

Characteristic wooly masses of wax on its body.

Feeds principally on roots and bark.

Usually overwinter on elms and the first generation is spent on that host. In early summer winged forms appear, they migrate to apple, hawthorn and related trees. Later in the season some migrate to elms, where the bisexual generation is produced and over wintering eggs laid. Other individuals migrate from the branches of the apple trees to the roots, where they produce gall-like growths. The root-inhabiting forms may remain there for a year or more, passing through several generations.

This aphid transmits perennial canker.