WSU Extension


Anthracnose and Bull's-eye rot 
Bitter pit 
Crown and collar rot 
Crown gall 
Cytospora canker 
Fire blight 
Fruit russeting 
Nectria canker (European canker) 
Nectria twig blight (Coral spot) 
Perennial canker (Bull's-eye rot) 
Phytophthora fruit rot 
Powdery mildew 
Virus diseases 
Apple ermine moth 
Apple maggot 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Codling moth 
Cutworms and armyworms 
Fruittree leafroller 
Lecanium scale 
San Jose scale 
Spider mites 
Tent caterpillars 
Tentiform leafminer 

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Caption: Nectria twig blight
Photo by: C.R. Foss
Apple : Nectria twig blight (Coral spot)
(revision date: 5/20/2014)

Nectria twig blight is caused by a fungus which invades plant tissues through wounds and natural openings in the bark. The infections typically occur on twigs and small branches. Cankers are initially small and sunken, gradually girdling the twigs after two or more seasons. Leaves above the canker wilt and die on girdled twigs. The cankered areas produce pinkish or coral-colored fruiting bodies of the fungus.
Management Options

Non-Chemical Management
  • Avoid wounding trees.
  • Prevent winter injury.
  • Provide proper culture to maintain healthy trees.
  • Prune out and destroy infected tissues during the summer. Remove all dead wood.
  • Correct pruning practices minimize injury and improve wound healing. For more information on pruning fruit trees see PNW 400, Training and Pruning Your Home Orchard, or contact your WSU Master Gardeners or county Extension agent.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Nectria twig blight
Photo by: C.R. Foss
Caption: Nectria twig blight
Photo by: R.S. Byther