Willow: Carpenterworm Categories: Ornamental trees Ornamentals Willow Willow Insects Last review date: 2025-06-28 08:34 Carpenterworm larval mine Photo 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 […]
Willow: Poplar and willow borer Categories: Ornamental trees Ornamentals Willow Willow Insects Last review date: 2025-06-28 08:41 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 […]
Willow: Satin moth Categories: Ornamental trees Ornamentals Willow Willow Insects Last review date: 2025-06-28 08:44 Satin moth Photo 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 […]
Willow: Spiny elm caterpillar Categories: Ornamental trees Ornamentals Willow Willow Insects Last review date: 2025-06-28 08:47 Spiny elm caterpillar Photo 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 […]
Willow: Bacterial twig blight Categories: Ornamental trees Ornamentals Willow Willow Diseases Last review date: 2025-06-28 08:48 Willow bacterial twig blight Photo 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 […]
Willow: Marssonina leaf and twig spot Categories: Ornamental trees Ornamentals Willow Willow Diseases Last review date: 2025-06-28 08:49 Marssonina leaf and twig spot Photo 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 […]
Willow: Rust Categories: Ornamental trees Ornamentals Willow Willow Diseases Last review date: 2025-06-28 08:52 Willow rust damage on upper leaf surface Photo 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 […]
Willow: Twig blight (Venturia) Categories: Ornamental trees Ornamentals Willow Willow Diseases Last review date: 2025-06-28 08:53 Willow twig blight cankers and dieback Photo 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 […]
Sycamore: Sycamore anthracnose Categories: Ornamental trees Ornamentals Sycamore Sycamore Diseases Last review date: 2025-06-28 08:55 Sycamore anthracnose leaf symptoms. Photo by: R.S. Byther Biology Sycamore anthracnose is a fungal disease affecting buds, leaves, and shoots. Young leaves appear brown and crinkled, with small to large dead areas often occurring along the main vein or on […]
Sycamore: Aphids Categories: Ornamental trees Ornamentals Sycamore Sycamore Insects Last review date: 2025-12-03 10:06 Aphid colony on leaf Photo by: A.L. Antonelli Biology Aphids are soft-bodied insects that typically feed on leaves and succulent stems. They may vary in color from pale green or reddish to dark or black. Aphids are usually less than 1/8″ […]
Poplar: Bacterial blight Categories: Ornamental trees Ornamentals Poplar Poplar Diseases Last review date: 2025-06-28 08:58 Poplar bacterial blight Photo by: C.R. Foss Biology Bacterial blight of poplar causes leaf spots, which begin as small, dark, water-soaked spots. Twig dieback and branch or trunk cankers may also occur. Blighted shoots often turn black and appear scorched […]
Poplar: Canker Categories: Ornamental trees Ornamentals Poplar Poplar Diseases Last review date: 2025-06-28 09:04 Canker on willow branch Photo by: R.S. Byther Biology Canker of poplar is a fungal disease infecting twigs and branches of all sizes. The fungi enter twigs through wound sites and cause development of sunken, circular, brown cankers in the bark. […]
Poplar: Leaf and shoot blight Categories: Ornamental trees Ornamentals Poplar Poplar Diseases Last review date: 2025-06-28 09:06 Poplar leaf and shoot blight Photo by: R.S. Byther Biology Leaf and shoot blight is a fungal disease which affects poplars, aspens, and willows. The fungus infects succulent leaves and twigs. Mature plant tissues are resistant. Initial symptoms […]
Poplar: Leaf blister Categories: Ornamental trees Ornamentals Poplar Poplar Diseases Last review date: 2025-06-28 09:08 Poplar leaf blister Photo by: R.S. Byther Biology Leaf blister is a fungal disease which infects the leaves of poplars. Leaves develop small to large yellow-green blisters or mounds on the upper surface. Severely infected leaves may be distorted. The […]
Poplar: Leaf rust Categories: Ornamental trees Ornamentals Poplar Poplar Diseases Last review date: 2025-06-28 09:10 Poplar rust Photo by: R.S. Byther Biology Rusts of poplar are fungal diseases which usually require alternate hosts to complete their life cycle. They overwinter on the poplar leaves, then infect the alternate host in the spring (alternate hosts include […]
Poplar: Carpenterworm Categories: Ornamental trees Ornamentals Poplar Poplar Insects Last review date: 2025-06-28 09:14 Carpenterworm larval mine Photo by: Unknown Biology Carpenterworms are the larvae of a mottled gray and black moth. The caterpillars are white to pinkish red with a dark head and 1″ to 3″ long when mature. They bore in the trunk […]
Poplar: Oystershell scale Categories: Ornamental trees Ornamentals Poplar Poplar Insects Last review date: 2025-06-28 09:17 Severe oystershell scale infestation on twig Photo by: Unknown Biology Oystershell scales are usually found on trunks, branches, and twigs. They occur infrequently on the leaves. Immature scales, or crawlers, are yellowish to white. They are typically present around June. […]
Poplar: Poplar petiole gall aphids Categories: Ornamental trees Ornamentals Poplar Poplar Insects Last review date: 2025-06-28 09:21 Poplar petiole gall aphid Photo by: A.L. Antonelli Biology Aphids which cause galling of the leaf stem (petiole) are small, soft-bodied insects. The females lay eggs on tree bark in the fall. The eggs hatch in the spring, […]
Poplar: Poplar-and-willow borer Categories: Ornamental trees Ornamentals Poplar Poplar Insects Last review date: 2025-06-28 09:22 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, legless, and about 1/4″ long at maturity. They feed by mining beneath the bark of trunk […]
Poplar: Satin moth Categories: Ornamental trees Ornamentals Poplar Poplar Insects Last review date: 2025-06-28 09:27 Satin moth Photo by: A.L. Antonelli Biology The caterpillars of the satin moth feed on leaves of poplars and willows. They may also occasionally attack oak and aspen. The adult moth is satiny and pure white, with a wingspan of […]