WSU Extension

Hortsense

Azalea
 
Disease
Botrytis petal blight 
Cylindrocladium blight & root rot 
Leaf and flower gall 
Leaf spot 
Lime-induced chlorosis 
Marginal leaf necrosis 
Nematode (stunt) 
Ovulinia petal blight 
Powdery mildew 
Root rot (Phytophthora) 
Insect
Azalea bark scale 
Azalea lace bug 
Azalea leafminer 
Obliquebanded leafroller 
Root weevils 
Spider mites 



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Caption: Azalea Cylindrocladium root rot
Photo by: R.S. Byther
  
Azalea : Cylindrocladium blight & root rot
(revision date: 4/14/2015)


Biology
This fungal disease may infect plants through the roots or stems and cause diverse symptoms. Leaf spots, cankers on stems, root rot, and/or sudden general wilting may be observed on infected plants. Cylindrocladium can be transmitted in infected soil, through movement by wind and water, and by hand. The fungus grows best in conditions of high temperature and high humidity and is only a greenhouse problem.
Management Options


Non-Chemical Management
  • Plant only disease-free material.
  • Use good sanitation to prevent spread of disease, which can be transmitted easily.
  • Remove and destroy diseased plants, including any fallen leaves.
  • Do not replant in infected soil.
Select non-chemical management options as your first choice!

Chemical Management

This disease is only a greenhouse problem. No fungicides are recommended for home landscapes.

Images

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Caption: Azalea Cylindrocladium root rot
Photo by: R.S. Byther
Caption: Azalea Cylindrocladium root rot
Photo by: R.S. Byther