Eriosoma ulmi

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Eriosoma ulmi - winged adult(click on image to enlarge it)
Author(s): S. Rae
Source: Wikimedia Commons

Eriosoma ulmi (Linnaeus, 1758) - (European elm leafcurl aphid)

This aphid develops on elm trees from autumn to spring (primary host) and on currant plants during the summer (secondary host). In spring, eggs overwintering in cracks of the bark on elm trees hatch and the larvae feed on the underside of young elm leaves, causing the leaves to roll and form pseudogalls. Each larva (fundadrix) hatching from an overwintering egg typically forms its own pseudogall and establishes a new colony, giving birth to new larvae. The new generation develops into winged adults which migrate to currant plants.

On currant, the aphids feed and multiply on the roots for several generations, giving birth to live nymphs. In autumn, winged adults are produced again which migrate back to elm trees and a last generation develops. Adults emerging during the last generation mate and lay eggs on the bark.

Synonyms:
Schizoneura ulmi