Viburnum Diseases

Informational table showing disease name, symptoms, pathogen/cause, and management of Viburnum diseases.
Viburnum Diseases - Articles

Updated: August 14, 2017

Viburnum Diseases
DiseaseSymptomsPathogen/CauseManagement
Botryosphaeria cankerLeaves on affected branches wilt and die. Branches die back and become covered with dark-brown to black pimple-like fungal fruiting structures. Wood under the bark is dark brown.BotryosphaeriaPlants most susceptible are those under drought stress. Therefore, irrigate to prevent drought stress. Prune infected branches.
Downy mildewAngular spots limited in shape by the leaf veins form blotches that die and shrivel in the spring when the weather is wet. Severely affected leaves fall. Light- colored fungal growth sparsely covers the spots on the underside of the leaf.Plasmopara viburniRake and destroy fallen leaves in the autumn. Avoid overhead irrigation in the spring. Apply a fungicide as soon as any disease is observed.
Powdery mildewWhite fungal growth forms on the upper surface of leaves.Erysiphe or PhyllactiniaNo control is recommended since little damage occurs. If severe, apply a fungicide.