Hawthorn: Apple-and-thorn skeletonizer categories: Hawthorn Hawthorn Insects Ornamental trees Ornamentals revision date: 2023-12-02 09:17 Apple-and-thorn skeletonizer caterpillar feeding on leafPhoto by: A.L. Antonelli Biology The adult of the apple-and-thorn skeletonizer is a small dark-brown moth. It overwinters as an adult, laying eggs in the spring. The caterpillars are yellow-green in color with black spots and […]
Hawthorn: Hawthorn aphid categories: Hawthorn Hawthorn Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Green peach aphid closeupPhoto by: Unknown Biology Hawthorn aphids are yellow-green to pinkish, soft-bodied insects typically found on the leaves in the spring. Aphid feeding causes young leaves to curl tightly and turn purplish. Older leaves are crinkled and deformed. Feeding […]
Hawthorn: Pear slug categories: Hawthorn Hawthorn Insects Ornamental trees Ornamentals revision date: 2022-11-22 03:33 Pear slug and damaged leaf from feedingPhoto by: R.D. Akre Biology Pear slugs, or pear sawflies, are insect larvae which resemble a small greenish or black slug. They are typically 1/4″ to 1/2″ long, tadpole-shaped. and produce large amounts of slime. […]
Hawthorn: Scale insects categories: Hawthorn Insects Ornamental trees Ornamentals revision date: 2023-04-04 12:00 Lecanium scales on twigPhoto by: R.S. Byther Biology Several species of scales may be found on hawthorn. In general, scales are approximately 1/16″ to 1/8″ in diameter, dull or shiny, and grayish to dark in color. They are typically found on the […]
Hawthorn: Fire blight categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals revision date: 2022-11-22 03:22 Biology Fire blight is a bacterial infection of shoots which enters the plant through blossoms, vigorously growing shoot tips, young leaves, and wounds. Blossom clusters appear blighted. Shoots suddenly wilt, turn black and die back, presenting a “scorched” appearance. Purplish cankers […]
Hawthorn: Leaf spot categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals revision date: 2022-11-22 03:16 Hawthorn leaf spotPhoto by: R.S. Byther Biology Leaf spot is a fungal disease which can infect hawthorn, photinia, pear, pyracantha, crabapple, and related species. Initial infections are small reddish-brown to grayish spots on the upper or lower leaf surface. The spots […]
Hawthorn: Rust categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals revision date: 2022-11-22 03:07 Rust pustules on underside of serviceberry leaf and on petiolePhoto by: R.S. Byther Biology Rust is a fungal disease typically infecting leaves of hawthorn (occasionally also apple and crabapple). It may also be found on green stems and fruit. Initial symptoms are […]
Hawthorn: Scab categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals revision date: 2022-11-22 02:48 Apple scab on leaves and young fruitPhoto by: R.S. Byther Biology Scab of hawthorn is caused by the same fungus that causes scab on apple and crabapple. The disease infects during wet weather in the spring and initially causes small pale, watersoaked […]
Hawthorn: Spider mites categories: Hawthorn Hawthorn Insects Ornamental trees Ornamentals revision date: 2022-11-22 02:43 Spider mites under microscopePhoto by: L.K. Tanigoshi Biology Spider mites are tiny, eight-legged and variably colored from yellow or green to red or brown. When viewed through a hand lens, they appear as tiny moving dots. Spider mites typically feed on […]