WSU Extension

Hortsense

Common Diseases : Root rots
(revision date: 4/30/2013)


Biology
Many different fungi that infect root tissues cause similar symptoms: off-color foliage, stunting, wilting, and death. Laboratory isolation and microscopic examination are needed for specific diagnosis. Cylindrocladium, Fusarium, Rhizoctonia, and Pythium are common fungal root rot pathogens.
Management Options

Non-Chemical Management
  • Correct drainage if water puddles near plants.
  • Plant only in deep, well-drained soil.
  • Avoid planting susceptible plants into soil with a history of root rot problems
  • Remove and destroy infected plant materials including roots when feasible to prevent spread of disease.
  • Do not replant in infested potting soil. Clean pots and containers prior to reuse.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images
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Caption: Pansy Rhizoctonia root rot
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
Caption: Cylindrocladium root rot
Photo by: R.S. Byther
Caption: Dieback on creeping hemlock due to Phytophthora root rot
Photo by: R.S. Byther