Birch (Betula)-Aphid


Common birch aphid (Calaphis betulaecolens)

European birch aphid (Euceraphis betulae)

Pest description and damage The common birch aphid is a large green aphid and the European birch aphid is a large green and black species dusted with a powdery wax. They both feed on the undersides of leaves and produce copious amounts of honeydew. Sometimes birch begins to lose its leaves by late summer; excessive aphid feeding may compromise the vigor of the host. Aphid honeydew is a sweet, sticky secretion that collects on underlying plant tissues and encourages growth of a black sooty mold. In addition to cosmetics, honeydew may become a sticky nuisance when it falls on decks, cars, or other landscape surfaces.

For biology, life history, monitoring and management

See "Aphid" in:

Management-cultural control

Insure that the plant receives enough water through the season. Place birch away from driveways, patios and decks to minimize the nuisance of honeydew.

Management-biological control

Check the tree trunk for ladybeetle adults, eggs, larvae and pupae. Also, check for swollen tan or gray aphids stuck to leaves as they are a sign of parasitoids.

Management-chemical control

See Table 1 in: