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: Cherry mottle leaf virus symptoms
Photo by: R.S. Byther
  
Common Diseases : Viruses
(revision date: 4/30/2013)


Biology
Viruses are submicroscopic in size, which means that they can be seen only with an electron microscope. Viruses are introduced into host plants by various means, including vectors such as insects, fungi, and nematodes. Tools can spread some viral diseases. Tobacco users can even transfer the tobacco mosaic virus from their hands to plant tissue. Leaf and fruit mosaics, stunting, severe distortion, chlorosis along veins and ringspots may be symptoms of virus infections.
Management Options

Non-Chemical Management
  • Destroy infected plants if the virus is transmissible.
  • Purchase disease-free plants.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Cherry mottle leaf virus symptoms
Photo by: R.S. Byther
Caption: Impatiens necrotic spot virus on begonia
Photo by: R.S. Byther
Caption: Sour cherry virus symptoms
Photo by: R.S. Byther
Caption: Bean yellow mosaic virus symptoms
Photo by: R.S. Byther
Caption: Virus "rat-tail" symptoms
Photo by: R.S. Byther
Caption: Vein-clearing symptom of virus infection
Photo by: R.S. Byther
Caption: Tomato spotted wilt virus symptoms on dahlia
Photo by: R.S. Byther
Caption: Virus symptoms on dahlia
Photo by: R.S. Byther
Caption: Dahlia mosaic virus symptoms
Photo by: R.S. Byther
Caption: Tobacco ringspot virus/Arabis mosaic virus on Forsythia
Photo by: R.S. Byther
Caption: Geranium virus symptoms
Photo by: R.S. Byther
Caption: Kalmia necrotic ringspot virus
Photo by: R.S. Byther
Caption: Pea mosaic virus
Photo by: R.S. Byther
Caption: Pear stony pit virus symptoms
Photo by: R.S. Byther
Caption: Rhododendron necrotic ringspot virus
Photo by: R.S. Byther
Caption: Tulip break (virus)
Photo by: R.S. Byther
Caption: Prunus virus
Photo by: R.S. Byther
Caption: Rose mosaic vein-clearing symptom
Photo by: R.S. Byther
Caption: Rose spring dwarf virus
Photo by: R.S. Byther
Caption: Tulip break (virus)
Photo by: R.S. Byther