WSU Extension

Hortsense

Common Diseases
 
Armillaria root rot 
Botrytis blight (Gray mold) 
Cankers 
Crown gall 
Damping-off 
Dead roots 
Dodder 
Downy mildew 
Dwarf mistletoe 
Galls 
Leaf spots and blights 
Nectria cankers 
Phytophthora root rot 
Powdery mildew 
Pseudomonas bacterial canker 
Root rots 
Rusts 
Sclerotinia white mold 
Sudden oak death 
Tubercularia canker 
Verticillium wilt 
Viruses 



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Caption: Diseased roots and healthy roots
Photo by: R.S. Byther
  
Common Diseases : Dead roots
(revision date: 4/30/2013)


Biology
A plant showing symptoms of off-color, stunting, wilting, and death may be suffering from a root problem. Dead and discolored roots result from factors such as fungal root rot disease, excessive moisture, excessive salts (fertilizer), cold damage, or lack of oxygen. It may be difficult to determine whether roots are dead or alive. Comparing the roots from a healthy plant with those of the problem plant is helpful.
Management Options

Non-Chemical Management
  • Protect plants against cold damage. Do not leave plants in containers outside during freezing weather.
  • Provide adequate drainage and do not overwater.
  • Do not overfertilize.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Diseased roots and healthy roots
Photo by: R.S. Byther
Caption: Phytophthora root rot on cedar
Photo by: R.S. Byther
Caption: Phytophthora root rot infecting trunk
Photo by: R.S. Byther