Viburnum: Bacterial blight (Leaf spot) categories: Ornamentals Shrubs Viburnum Viburnum Diseases revision date: 2022-12-04 12:00 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, watersoaked areas which may be round, irregular, or angular in outline. Developing leaves may […]
Viburnum: Leaf spot categories: Ornamentals Shrubs Viburnum Viburnum Diseases revision date: 2022-12-04 12:00 Viburnum leaf spotPhoto 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 (IPM) for […]
Viburnum: Powdery mildew categories: Ornamentals Shrubs Viburnum Viburnum Diseases revision date: 2022-12-04 12:00 Powdery mildew on viburnum leafPhoto 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 on either […]
Viburnum: Ramorum leaf and shoot blight (Sudden oak death) categories: Ornamentals Shrubs Viburnum Viburnum Diseases revision date: 2022-12-04 12:00 P. ramorum leaf tip necrosis symptom on viburnumPhoto 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 been found […]
Viburnum: Shoot blight (Gray mold) categories: Ornamentals Shrubs Viburnum Viburnum Diseases revision date: 2022-12-04 12:00 Viburnum Botrytis stem rotPhoto 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 the leaf […]