WSU Extension

Hortsense

Peach
 
Disease
Bacterial canker 
Brown rot 
Crown gall 
Cytospora canker 
Leaf curl 
Powdery mildew 
Shothole (Coryneum blight) 
X-disease 
Insect
Aphids 
Brown marmorated stink bug 
Earwigs 
European red mite 
Leafrollers 
Peach twig borer 
Peachtree borer 
Spotted wing Drosophila (SWD) 



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Caption: Cytospora-infected peach twigs
Photo by: R.S. Byther
  
Peach : Cytospora canker
(revision date: 5/20/2014)


Biology
The fungi which cause Cytospora canker attack through wounds on twigs and branches. Initial cankers are small, but enlarge quickly and may streak up and down the stems without girdling. The cankers may also girdle twigs, resulting in dieback above the infection site and causing "flags" of dead material to appear in the canopy. The leaves on the dead twigs turn color and droop, but often remain attached. The canker itself appears as a dark, sunken area of dead bark and wood. Later callus forms at the margin of the canker. Amber gumming is often present. Pinhead-sized black fruiting structures of the fungi often erupt through the bark and produce reddish tendrils or droplets of spores in wet weather. Spores are easily spread by wind, rain, and insects. The cankers enlarge for several seasons.
Management Options

Non-Chemical Management
  • Provide proper planting sites and culture. Healthy trees are more resistant to disease and winter injury.
  • Avoid wounding trees.
  • Control insect and disease problems to minimize injuries.
  • Prune out and destroy infected tissues during dry weather. Make cuts at least 12" below visibly infected area. Sterilize pruning tools frequently.
  • Rake and destroy infected twig debris.
  • Correct pruning practices minimize injury and improve wound healing. For information see PNW 400, Training and Pruning Your Home Orchard, or contact WSU Master Gardeners or your county Extension agent.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Cytospora-infected peach twigs
Photo by: R.S. Byther