Birch: Aphids Categories: Birch Birch Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Aphid colony on leaf Photo by: A.L. Antonelli Biology Aphids are small yellowish to greenish insects often found on the underside of leaves and on new growth. Aphids on birch typically feed on the leaf veins and produce […]
Birch: Birch leafminer Categories: Birch Birch Insects Ornamental trees Ornamentals Last review date: 2026-02-27 11:38 Last edit date: Birch leafminer damage. Photo by: A.L. Antonelli Biology The birch leafminer is the larvae of a small (about 1/8″-3/8″) black sawfly. The adult sawfly lays eggs in new leaves. The larvae emerge and feed in leaf tissues, […]
Birch: Bronze birch borer Categories: Birch Birch Insects Ornamental trees Ornamentals Last review date: 2026-02-27 11:48 Last edit date: Bronze birch borer damage Photo by: Unknown Biology Adult bronze birch borers are olive to bronze-colored beetles approximately 1/2″ long. They lay their eggs in bark cracks or under flaps of bark. The larvae bore into […]
Birch: Canker Categories: Birch Birch Diseases Ornamental trees Ornamentals Last review date: 2026-02-27 12:08 Last edit date: Botryosphaeria canker with fruiting bodies emerging on birch tree trunk Photo by: R.S. Byther Biology Several fungal pathogens can cause canker disease of twigs and branches. Young cankers appear darker and slightly more sunken than adjacent healthy bark. […]
Birch: Oystershell scale Categories: Birch Birch Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Severe oystershell scale infestation on twig Photo by: Unknown Biology Oystershell scale insects are found on trunks, branches, and twigs of many broadleaved deciduous plants. They occur less frequently on the leaves and other plant parts. The […]
Birch: Rust Categories: Birch Birch Diseases Ornamental trees Ornamentals Last review date: 2026-02-27 12:31 Last edit date: Birch rust on leaves Photo by: R.S. Byther Biology Birch rust is a fungal disease which first appears on leaves in early summer. Initially, small yellow angular spots develop on leaves. These may expand into brown spots with […]