WSU Extension

Hortsense

Viburnum
 
Disease
Bacterial blight (Leaf spot) 
Leaf spot 
Powdery mildew 
Ramorum leaf and shoot blight (Sudden oak death) 
Shoot blight (Gray mold) 
Insect
Bean aphids 
Root weevils 
Viburnum leaf beetle 



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Caption: Viburnum Botrytis stem rot
Photo by: R.S. Byther
  
Viburnum : Shoot blight (Gray mold)
(revision date: 4/23/2014)


Biology
Shoot blight of viburnum is caused by Botrytis cinerea, a fungus commonly found on ornamentals, greenhouse plants and flowers, vegetables, and small fruits. Viburnums develop gray to brown spots along the leaf margins. The spots spread to involve the entire leaf. Flowers are blighted and shoots may be killed back. The fungus may be seen on affected plant parts as a sparse, fuzzy, gray-brown growth. The fungus may also develop dark structures on blighted tissues. This disease is favored by wet weather.
Management Options


Non-Chemical Management
  • Plant in full sun.
  • Space plants and prune to provide good air circulation.
  • Remove and destroy infected leaves and shoots. Collect infected tissues carefully to avoid spreading the disease.
  • Rake and destroy fallen leaves.
  • Avoid overhead watering.
  • Provide proper culture. Healthy, unstressed plants are more resistant to disease.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Viburnum Botrytis stem rot
Photo by: R.S. Byther