Viburnum: Bacterial blight (Leaf spot) categories: Ornamentals Shrubs Viburnum Viburnum Diseases last review date: 2025-06-27 10:05 Viburnum bacterial blight (leaf spot) Photo by: R.S. Byther Biology Bacterial blight of viburnum primarily affects leaves and occasionally stems. Spots on leaves first appear as brown, water-soaked areas which may be round, irregular, or angular in outline. Developing […]
Viburnum: Leaf spot categories: Ornamentals Shrubs Viburnum Viburnum Diseases last review date: 2025-10-14 08:42 Viburnum leaf spot Photo by: J.R. Glass Biology Various fungi cause leaf spot symptoms on viburnum. The spots are typically necrotic brown spots of varying sizes. At least one bacterial leaf spot is also common. Management Options Use Integrated Pest Management […]
Viburnum: Powdery mildew categories: Ornamentals Shrubs Viburnum Viburnum Diseases last review date: 2025-06-27 10:13 Powdery mildew on viburnum leaf Photo by: B.M. Johnson Biology Powdery mildew of viburnum is a fungal disease which primarily affects young leaves and shoots. Affected plant tissues develop a powdery white growth of fungal mycelia. The fungus can be found […]
Viburnum: Ramorum leaf and shoot blight (Sudden oak death) categories: Ornamentals Shrubs Viburnum Viburnum Diseases last review date: 2025-06-27 10:15 P. ramorum leaf tip necrosis symptom on viburnum Photo by: M. Elliott Biology Ramorum leaf blight is caused by Phytophthora ramorum, the same organism that causes sudden oak death (SOD). In Washington, most cases have […]
Viburnum: Shoot blight (Gray mold) categories: Ornamentals Shrubs Viburnum Viburnum Diseases last review date: 2025-06-27 10:17 Viburnum Botrytis stem rot Photo by: R.S. Byther Biology Shoot blight of viburnum is caused by Botrytis cinerea, a fungus commonly found on ornamentals, greenhouse plants and flowers, vegetables, and small fruits. Viburnums develop gray to brown spots along […]
Viburnum: Bean aphids categories: Ornamentals Shrubs Viburnum Viburnum Insects last review date: 2025-05-13 08:32 Bean aphid on leaf K. Grey Biology Bean aphids are soft-bodied dark green to black insects commonly found on the undersides of leaves and on new growth. They often occur in dense colonies. Heavy aphid feeding may distort shoot tips and […]
Viburnum: Root weevils categories: Ornamentals Shrubs Viburnum Viburnum Insects last review date: 2025-06-27 10:20 Root weevil damage on viburnum Photo by: A.L. Antonelli Biology Root weevil larvae feed on the roots and bark of plants near the crown. The white grubs are found in the soil around the roots. Heavy feeding by root weevil larvae […]
Viburnum: Viburnum leaf beetle categories: Ornamentals Shrubs Viburnum Viburnum Insects last review date: 2025-06-27 10:21 Viburnum leaf beetle larvae and damage Photo by: T. Murray Biology Viburnum leaf beetles overwinter as eggs on the previous year’s new stems. Larvae hatch in spring and begin to feed on the new viburnum leaves. Larvae are pale yellow […]