Willow

Willow: Carpenterworm

Willow: Carpenterworm categories: Ornamental trees Ornamentals Willow Willow Insects revision date: 2022-11-29 12:00 Carpenterworm larval minePhoto by: Unknown Biology Carpenterworms are the larvae of a mottled gray and black moth. The caterpillars are white or pinkish-red with a dark head and 1″ to 3″ long when mature. They bore in the trunk and main branches […]

Willow: Poplar and willow borer

Willow: Poplar and willow borer categories: Ornamental trees Ornamentals Willow Willow Insects revision date: 2022-11-29 12:00 Poplar-and-willow borer adult Biology The adult poplar-and-willow borer is a black and white weevil (a flightless beetle) about 3/8″ long. The larvae are white and legless and mine beneath the bark and in trunk and branches. Feeding larvae expel […]

Willow: Satin moth

Willow: Satin moth categories: Ornamental trees Ornamentals Willow Willow Insects revision date: 2023-04-12 12:00 Satin mothPhoto by: A.L. Antonelli Biology The caterpillars of the satin moth feed on leaves of willows and poplars. They may also occasionally attack oak and aspen. The adult moth is satiny and pure white, with a wingspan of 1 1/2″ […]

Willow: Spiny elm caterpillar

Willow: Spiny elm caterpillar categories: Ornamental trees Ornamentals Willow Willow Insects revision date: 2023-04-12 12:00 Spiny elm caterpillarPhoto by: S.J. Collman Biology The spiny elm caterpillar is the larval stage of the mourningcloak butterfly. The adult is approximately 2 1/2″ across, with purplish-brown to blackish wings bordered by a creamy yellow stripe and a row […]

Willow: Bacterial twig blight

Willow: Bacterial twig blight categories: Ornamental trees Ornamentals Willow Willow Diseases revision date: 2022-11-29 12:00 Willow bacterial twig blightPhoto by: R.S. Byther Biology Bacterial twig blight of willow is caused by the same bacterium that causes bacterial blight of lilac and other woody ornamentals. The disease attacks twigs and branches, causing them to die back. […]

Willow: Marssonina leaf and twig spot

Willow: Marssonina leaf and twig spot categories: Ornamental trees Ornamentals Willow Willow Diseases revision date: 2022-11-29 12:00 Marssonina leaf and twig spotPhoto by: R.S. Byther Biology Marssonina leaf and twig spot is a fungal infection of twigs and leaves. Initially, small brown to black spots develop on leaves and green twigs. The spots may have […]

Willow: Rust

Willow: Rust categories: Ornamental trees Ornamentals Willow Willow Diseases revision date: 2022-11-29 12:00 Willow rust damage on upper leaf surfacePhoto by: R.S. Byther Biology Willow rusts are fungal diseases that begin in early summer, but are most noticed in late summer to early fall. Leaves first display yellow spots, which turn dark brown or black […]

Willow: Twig blight (Venturia)

Willow: Twig blight (Venturia) categories: Ornamental trees Ornamentals Willow Willow Diseases revision date: 2022-11-29 12:00 Willow twig blight cankers and diebackPhoto by: R.S. Byther Biology Also known as scab, willow twig blight infects leaves and twigs. The fungus first infects new foliage in the spring, causing brown to dark spots along the midrib of the […]