Anoecia corni

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Anoecia corni colony feeding on grass roots (click on image to enlarge it)
Source: InfluentialPoints
Anoecia corni winged form (click on image to enlarge it)
Source: InfluentialPoints

Anoecia corni (Fabricius, 1775) - (dogwood-grass aphid)

This aphid is widely distributed in Europe, Asia and northern Africa. It has also spread to the Americas. Dogwood (Cornus) is infested as primary host and cereals or grasses in the summer as secondary hosts.

On dogwood, the females lay egg in autumn which overwinter and hatch in spring. After winged forms develop, they migrate to cereals and grasses where they feed on the roots. Winged forms emerge in autumn that migrate back to dogwood. Both on the primary and on the secondary host, A. corni colonies are often attended and protected by ants.