Fungal leaf spot disease of viburnums results in the presence of abnormal spots on leaf surfaces in red to gray-brown that expand and form larger splotches. Downy mildew is another disease that is favored by cool, moist conditions. Leaves on one or more branches wilt, die and turn brown; Cankers are sunken, dark colored areas on branches; Fungal fruiting bodies give canker area a rough or pimpled appearance; Mapleleaf Viburnum (Viburnum acerifolium): Native to the mountains and upper Piedmont of South Carolina, this species grows slowly to 6 feet tall and 4 feet wide, and has dark green leaves with three lobes, like maple leaves.This species has excellent fall color with leaves turning bright pink to reddish purple in fall. Brown spots on Viburnum are a symptom of several diseases that can reduce the vigor and reduce the aesthetic value of the plant. Destroy infected leaves. Powdery mildew, a viburnum disease caused by a fungus, tends to develop when the weather delivers warm days, cool nights and high humidity. To control viburnum leaf spot, keep leaves dry by watering at the base of the plant. viburnum. looks as though it is dead. If your Viburnum has angular shaped, water soaked, diseased areas on its leaves, the plant may have bacterial leaf spot, also known as bacterial blight. This disease is caused by Pseudomonas syringae pv. Bacterial leafspot causes round, water-soaked spots on leaves and young stems. I have attached a photograph. Hello My Viburnum odoratissimum leaves have brown spots. A layer of exuded bacterial cells often found on the leaf surface can make the leaves shiny. Viburnum is a genius of temperate climate shrubs and trees. 2nd Viburnum in the space of 3 years that this has happened. The leaves were dying but not spotted. If infection occurs early in the season, leaves can become distorted. Botryosphaeria canker Botryosphaeria dothidea. Rain helps to slow this viburnum disease, which is always more severe on plants sited in shade. I am located in Melbourne Australia and we have just into spring. As a result, figuring out what has caused leaf browning is an essential first step in protecting your plants. Plants can be harmed by many problems including pests, diseases and environmental factors, but they can only respond in a limited number of ways – developing brown leaves is the most common. In early June 2019, one client arriving with a sample of holey leaves and live viburnum leaf beetle larvae, said the larvae had “devoured all the leaves on my [arrowwood] viburnum last spring and are doing it again this year.” This is a good example of the intensive defoliation that can be caused by viburnum leaf beetle (VLB). It causes angular leaf spots much like bacterial leaf spot; but lesions start out yellow, become brown, and may coalesce to form large brown blotches. Do you think whatever happened to the parent plant has transferred to its cutting? What causes the brown spots and how do I solve the problem? 1 of 4. Sweet Viburnum is also infested by thrips, mites, white-fly, bagworms, and sooty mold, but none are normally serious. Increasing airflow and avoiding moisture on leaf surfaces can help prevent infection, while early chemical control can reduce the severity of these diseases. I … My viburnum bushes appear to be dying or are infected. These develop into shrunken, brown areas about 1/8-inch in diameter. The leaves are turning red/brown, falling off and dying, and branches are weak at base of plant, falling off as well. With powdery mildew, young viburnum leaves and shoots develop a white to light gray fungus covering on leaves. My Viburnum's leaves have dried up and turned brown. This particular plant was a cutting I took from the original. Also the leaves of the plant are light green. Viburnum > Leaves > Leaves brown to black and wilted. 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