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: Damping-off of cucumber seedlings
Photo by: R.S. Byther
  
Common Diseases : Damping-off
(revision date: 4/30/2013)


Biology
Damping-off is caused by fungi that remain in the soil for long periods of time. Infected seeds decay without germinating. Seedlings may be infected and fail to emerge from the soil. Emerging seedlings are also attacked, causing them to wilt and topple over. Water-soaked or brownish lesions are often visible on the stem at the soil line. Plants become more resistant to attack as they mature. Damping-off fungi are more of a problem in cold soils with poor drainage, and in conjunction with overwatering.
Management Options

Non-Chemical Management
  • Do not overwater.
  • Do not plant in soils known to be infested with damping-off fungi.
  • Fertilize by placing a band of phosphate fertilizer 1" beneath the seed, covering with soil, then seeding rows.
  • Mulch to help raise soil temperature.
  • Plant in warm, well-drained soils during warm, dry weather.
  • Plant shallowly to encourage quick seedling emergence and growth.
Select non-chemical management options as your first choice!

Chemical Management

Images

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Caption: Damping-off of cucumber seedlings
Photo by: R.S. Byther
Caption: Damping off of seedlings
Photo by: R.S. Byther
Caption: Damping-off of seedlings
Photo by: R.S. Byther
Caption: Damping off of petunia seedlings
Photo by: R.S. Byther