Crabapple: Spider mites categories: Crabapple Crabapple Insects Ornamental trees Ornamentals revision date: 2024-06-05 02:04 Spider mites under microscopePhoto by: L.K. Tanigoshi Biology Spider mites on crabapple vary in color. They may be yellow, green, red or brown. They have eight legs and are very small, appearing as moving dots when viewed through a hand lens. […]
Crabapple: Stem rot categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals revision date: 2022-11-21 02:02 Crabapple stem rot: rotten stem has a dark blotchPhoto by: R.P. Regan Biology Stem rot of crabapple is caused by a soil-borne fungus. This disease is most prevalent in the winter on nursery stock. The fungus infects through wounds on the […]
Birch: Aphids categories: Birch Birch Insects Ornamental trees Ornamentals revision date: 2024-06-05 08:29 Aphid colony on leafPhoto 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 large amounts of honeydew, a […]
Birch: Birch leafminer categories: Birch Birch Insects Ornamental trees Ornamentals revision date: 2024-06-05 10:25 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, leaving blotch-shaped or winding brown […]
Birch: Bronze birch borer categories: Birch Birch Insects Ornamental trees Ornamentals revision date: 2024-06-05 02:07 Bronze birch borer damagePhoto 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 the branches or trunk after […]
Birch: Canker categories: Birch Birch Diseases Ornamental trees Ornamentals revision date: 2022-11-21 01:15 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. As they grow, they […]
Birch: Oystershell scale categories: Birch Birch Insects Ornamental trees Ornamentals revision date: 2024-06-05 08:29 Severe oystershell scale infestation on twigPhoto 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 mature scale is approximately 1/8″ […]
Birch: Rust categories: Birch Birch Diseases Ornamental trees Ornamentals revision date: 2022-11-21 12:58 Birch rust on leavesPhoto 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 yellow edges. Later in the […]
Ash: Aphids categories: Ash Ash Insects Ornamental trees Ornamentals revision date: 2024-04-08 11:46 Aphid colonyPhoto by: Unknown Biology Aphids are small, soft-bodied insects that typically feed near the tip of growing shoots. Their feeding may deform leaves (curling, distortion) and stunt terminal growth. Aphids range in size up to 1/8″ long and often produce honeydew, […]
Ash: Ash borer categories: Ash Ash Insects Ornamental trees Ornamentals revision date: 2022-11-21 12:29 ash borer pupal ‘skeleton’Photo by: A.L. Antonelli Biology The ash borer, also known as the lilac borer, is a member of the clearwing moth family. The adults of many clearwing moths mimic yellowjackets or paper wasps. The larvae of this moth […]
Ash: Anthracnose categories: Ash Ash Diseases Ornamental trees Ornamentals revision date: 2024-06-05 02:07 Ash anthracnosePhoto by: R.S. Byther Biology Anthracnose is a fungal disease of leaves and twigs of many ash species, including black, green, red, velvet, and white ash. Symptoms of anthracnose arise in spring on succulent, expanding shoots and leaves as water-soaked spots […]
Ash: Nectria canker categories: Ash Ash Diseases Ornamental trees Ornamentals revision date: 2022-11-21 12:22 Nectria canker fruiting bodiesPhoto by: R.S. Byther Biology Nectria canker is a fungal disease often found on twigs and branches that have been weakened by drought, frost damage, insect damage, or other diseases. Cankers are initially distinguished by discolored bark with […]