Articles

Viburnum Diseases

Name: Viburnum Diseases
SKU: ART-4097

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

Updated:

November 21, 2023

Disease	Symptoms	Pathogen/Cause	Management
Botryosphaeria canker	Leaves on affected branches wilt and die. Branches die back and become covered with dark-brown to black pimple-like fungal fruiting structures. The wood under the bark is dark brown.	Botryosphaeria	Plants most susceptible are those under drought stress. Therefore, irrigate to prevent drought stress. Prune infected branches.
Downy mildew	Angular 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 viburni	Rake and destroy fallen leaves in the autumn. Avoid overhead irrigation in the spring. Apply a fungicide as soon as any disease is observed.
Powdery mildew	White fungal growth forms on the upper surface of leaves.	Erysiphe or Phyllactinia	No control is recommended since little damage occurs. If severe, apply a fungicide.