WSU Extension

Hortsense

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
    - hide images

+ Show larger images

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