WSU Extension


Crown gall 
European canker (Nectria canker) 
Fire blight 
Pacific Coast pear rust 
Pear trellis rust 
Powdery mildew 
Pseudomonas blossom blast and dieback 
Stony pit 
Virus diseases 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Codling moth 
Cutworms and armyworms 
Pear psylla 
Pear slug (pear sawfly) 
Pearleaf blister mite 
San Jose scale 
Spider mites 

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Caption: Apple mosaic virus
Photo by: R.S. Byther
Pear : Virus diseases
(revision date: 5/20/2014)

Virus diseases of pears in home orchards seldom cause significant problems. Symptoms of common viruses are seen on bark, leaves, and fruit. Some virus diseases may cause bark to appear roughened or blistered. Most common virus diseases of pears are transmitted by grafting or other mechanical means. For more information on stony pit virus, see Pear: Stony pit virus.
Management Options

Non-Chemical Management
  • Plant only certified virus-free stock.
  • Do not perform grafts with wood from infected trees.
  • Remove and destroy severely affected trees, if desired.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Apple mosaic virus
Photo by: R.S. Byther
Caption: Pear stony pit virus symptoms
Photo by: R.S. Byther