Viburnums sometimes have problems with foliar diseases, including bacterial leaf spot, downy mildew, and powdery mildew. For more information see file on Controlling Fungal Disease Leaves Covered With White Powder due to Powdery Mildew Powdery mildew, caused by a fungus, develops mostly on the upper surfaces of viburnum leaves and appears as whitish blotches. A layer of exuded bacterial cells often found on the leaf surface can make the leaves shiny. A few possible sightings of this pest were reported in 2013 an 2014. The larvae are a greenish-yellow, somewhat blending in with the foliage. If infection occurs early in the season, leaves can become distorted. My Viburnum's leaves have dried up and turned brown. viburnum. The larvae (April to June) can be up to 8mm long, while the adult beetles (late July to September) are greyish brown in colour and around 4.5-6mm long. 2nd Viburnum in the space of 3 years that this has happened. Downy mildew (Plasmopara viburni) disease causes leaf spots and defoliation on viburnum varieties.Some literature indicates that downy mildew is favored by nighttime temperatures of about 50 to 72°F, and the disease has been reported on Viburnum … Viburnum (Viburnum) Plant Health Problems Diseases caused by Fungi: Powdery mildew, Microsphaera penicillata. The adults are about a 1/4 inch long (4.5 to 6.5 mm) and a dull brown, as are the tiny eggs. Viburnum leaf beetles are rather bland looking for an exotic pest and can be easily missed. Plants may be wilted; Stems may dieback or have sparse foliage with a few leaves at tip; Lower part of stems are gnarled and scarred with sawdust; Pupal cases may be found sticking out of holes in bark in spring; Entire bush may die This disease is favored by hot, humid weather and usually develops late in the season. This disease is caused by Pseudomonas syringae pv. Insects, Diseases, and Other Plant Problems: In colder winter areas it may experience winter die-back. They grow to about 1/2 inch long. Both larvae and adults feed on viburnum foliage. To control viburnum leaf spot, keep leaves dry by watering at the base of the plant. This particular plant was a cutting I took from the original. It is a relatively new pest to the Chicago region. Viburnum beetles are a species of leaf beetle that feast on shrubs from the viburnum family. 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. Viburnum leaf beetle has been known in some eastern states since the early 1990’s. Symptoms appear as a white, mealy growth on the leaves. Viburnum clearwing borer Synanthedon viburni. Control. It causes angular leaf spots that appear water-soaked. Do you think whatever happened to the parent plant has transferred to its cutting? Plasmopara viburni. It helps to know what diseases are possible on a given host. Powdery mildew disease on viburnum plants produces a white to gray growth of fungus that resembles powder on foliage surfaces, according to the Clemson University Extension. Leaves are wrinkled, tomentose above and below Extreme cases result in malformed leaves. Use in mixed shrub borders or as a hedge. Plant where it can be protected from winter winds. 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. The leaves and blooms are showy and the bright red berries can last into winter. looks as though it is dead. In late summer, bushes in shady spots may be badly infected. Bacterial leaf spot is a disease present in cool, wet weather. 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