Meet an evergreen viburnum with intense spring fragrance. The reported problem appeared in hot, dry weather of late summer. What is viburnum scale? viburni, a bacterium that can be a problem in cool, wet springs. Kelly Givens explains some of the problems that can affect cherries and how to protect the harvest. Leaves on affected branches wilt and die. Do you think whatever happened to the parent plant has transferred to its cutting? It is most common when the weather is wet. It is characterized by fine white dusty growth on the upper surfaces of leaves. Though sweet potatoes are vulnerable to disease and a number of pests, keeping them healthy is easy. syringae may also occur on viburnum in the PNW. Among the most common causes for viburnum leaves turning brown or black are leaf spot diseases. For instance, don’t tuck a viburnum into deep shade unless that’s what recommended for it. Leaf Spot Various fungi, including the anthracnose fungus, can cause viburnum leaves to develop black, sunken lesions. Viburnum scale is is only found on the foliage of Viburnum tinus and ivy . With both viburnum diseases, rake up and destroy any fallen leaves. You love to DIY. Avoid overhead irrigation in the spring. Viburnum Leaf Beetle, Pyrrhalta viburni This leaf-feeding beetle was first found in Connecticut in 2004. Most of the viburnum diseases that attack plants are leaf diseases, and the majority of these diseases aren’t intensely damaging to the plants. You must have JavaScript enabled in your browser to utilize the functionality of this website. Fungal leaf spot, caused by fungi of the Cercospora species, Phoma species and Phyllosticta species, result in foliage damage. Browse a full list of topics found on the site, from accessories to mudrooms to wreaths. Viburnum leaf beetle larvae are longer [6.1 to 9.4 mm (0.24 to 0.36 in)] than adult viburnum leaf beetles and are elongate and with a shiny, greenish-yellow body covered with black dots (Barr and Hoover 2011). Powdery mildew, a viburnum disease caused by a fungus, tends to develop when the weather delivers warm days, cool nights and high humidity. Rake and destroy fallen leaves in the autumn. Most diseases that affect viburnums are fungal in nature. Damaged leaves are often also discoloured with brown dried up edges to the holes. Viburnum beetles are a species of leaf beetle that feast on shrubs from the viburnum family. Adult females are flat, oval, pale yellow and up to 4mm long. Occasionally, viburnum diseases may strike, but their occurrence is typically rare. Angular spots limited in shape by the leaf veins form blotches that die and shrivel in the spring when the weather is wet. Although the bacteria survive on the outside of the plant they must get inside and multiply in the space between plant cells (apoplast) to cause disease. Choose viburnums for a true low maintenance plant. Let's get together. Light- colored fungal growth sparsely covers the spots on the underside of the leaf. Although most viburnums are not seriously troubled by diseases or pests, several problems can occur, particularly when plants are stressed or in poor growing conditions. Apply a fungicide as soon as any disease is observed. Adjust soil pH as needed. As with nearly any plant, the best way to prevent viburnum diseases is by giving plants ideal growing conditions. Most viburnums need soil that’s slightly acid, although some, like Viburnum farreri, thrive in a more acid soil. With powdery mildew, young viburnum leaves and shoots develop a white to light gray fungus covering on leaves. This condition does not affect healthy plants; it requires a damaged or weakened host. 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