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