Viburnum leaf surfaces are flecked and whitened; leaf tips whither, curl and die. may be causing this. They are in the sun and get water regularly. Prune infected branches. To control the leaf spot viburnum diseases, follow the same practices for powdery mildew control. Infection with this fungus causes dieback and the leaves to wilt. Familiarize yourself with the infections and controls for surefire identification and management of any problems that arise. It looks like grey aphids (?) Q. Downy mildew With both viburnum diseases, rake up and destroy any fallen leaves. Spots may begin small, but enlarge or merge , and may be reddish to grayish brown. When established, Chinese Snowball Viburnum are quite drought tolerant. These fungal leaf spots on viburnum typically are angular to irregular-shaped, and the leaf tissue in the spots is sunken and dry. Verticillium wilt is a soil-borne fungal disease of many fruit, vegetables and ornamental plants that enters the plant through the roots. A variety of leaf spots are caused by the fungi Cercospora spp., Phoma spp., and Phyllosticta spp. How far back should I prune them? The middle one lost several major branches over the winter, the leaves are drooping and some are turning yellow. Wilting leaves, which is actually defined as having water loss or being dehydrated, is obviously associated with a lack of water. Botryosphaeria canker Botryosphaeria dothidea. Viburnum > Leaves > Leaves brown to black and wilted. If you see new leaves wilting or the tips of new stems bending over during dry weather this could be a sign your plants … Sometimes a newly planted plant is over or underwatered, either can be indicated by the wilting. My ten year old viburnum davidii shrubs only have leaves growing on the outside tips of the branches. What is causing this condition? Drooping Leather Leaf Viburnum. On about 1/3 of the shrub, the leaves are wilting and dying. Wilting leaves will be dry to the touch and even a bit crumbly. These leaf spot viburnum diseases usually occur during summer months, when conditions are warm and moist. Wood under the bark is dark brown. Leaf Curl Problem on Viburnum For two seasons, when the leaves develop, leaf curl sets in and has damaged a viburnum shrub. I can't find any spots or anything on the wilting leaves which are curling under and now getting pretty dry. Two of them are absolutely thriving and healthy. ... yellow or white, powdery, raised localized spots. Leaf undersides are spotted with tiny black specks of excrement. user-7008887 09/13/2017 . The leaves on the rest of the shrub look just fine. These plants generally do best in an evenly moist yet well drained soil that is acidic and humusy. Therefore, irrigate to prevent drought stress. I have three leather leaf viburnums in my yard -- located with 30 feet of each other. Botryosphaeria: Plants most susceptible are those under drought stress. 1 of 4. 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; Only during prolonged drought will established plants require supplemental irrigation. The moister the soil, the more sun they can handle in relative terms, but the soil should never be saturated. Something's wrong with one of my viburnums. Leaves on affected branches wilt and die. Viburnum plants are susceptible to an array of fungal infections that cause disease and severely damage the plant. You’ll usually see the first spots on older leaves. Branches die back and become covered with dark-brown to black pimple-like fungal fruiting structures. My viburnums set fruit in some years but not in others. Infected leaves wilt and wither and the plants may be stunted. There are almost no inner leaves at all. Asked April 26, 2019, 9:41 AM EDT. 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