They give rise to apterae which feed on the upper side of leaves.
Winged individuals appear during the summer and spread to reed, etc.
From late August onwards, winged sexuparae and males return to primary host-plants. L ife Cycle Large numbers of aphids are apterous and remain on primary host-plants. Alatae emerge during the summer, not migrating to reed but spreading to other Prunus . D amage Infestations spread to the foliage, causing premature leaf fall, an atrophy of fruits and a significant loss of vigour of trees. Deatailed picture of a colony Winged individuals. .