Life cycle (Rosy leaf curling aphid)

• Overwintered eggs are laid under loose bark or in deep crevices in the bark of the main trunk and branches of the tree.
• The eggs hatch in spring at early green cluster and colonies develop on the undersides of the rosette leaves.
• Later, infestations develop in the young shoots.
• In the third generation, winged and wingless females are produced and in the fourth generation, winged males but wingless females.
• These sexual forms mate and eggs are laid from mid-June to mid-July.
• Colonies die out in mid-summer, most live aphids disappearing by the end of July.
• There is no evidence of infestations spreading from tree to tree by winged migrants.
• Spread from tree to tree is slow and may be caused by walking aphids.