WSU Extension

Hortsense

Rose
 
Disease
Black mold 
Black spot 
Botrytis bud and twig blight 
Brand canker 
Bullheading (cold damage) 
Common canker 
Crown gall 
Downy mildew 
Powdery mildew 
Rust 
Viruses 
Insect
Leafcutting bees 
Leafrollers 
Redhumped caterpillar 
Root weevils 
Rose aphids 
Rose galls 
Rose leafhopper 
Rose midge 
Roseslug 
Spider mites 
Thrips 
Tobacco budworm 
Western spotted cucumber beetle 



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Caption: Rose common canker
Photo by: R.S. Byther
  
Rose : Common canker
(revision date: 4/23/2014)


Biology
Common canker is a fungal disease that infects plants through long stubs left by improper pruning or through other wound sites. Small yellow or reddish spots appear on canes and gradually enlarge. Later, the centers of the spots turn light brown and develop lengthwise slits in the bark. Common cankers have dark brown edges and often occur at the cut ends of canes. Common canker may resemble brand canker.
Management Options


Non-Chemical Management
  • Avoid wounding plants.
  • Prune properly with sharp tools to avoid pruning wounds. Do not leave long stubs.
  • Remove all infected canes below the diseased portion.
  • Avoid overhead watering.
  • Provide proper culture to keep plants healthy and more disease-resistant.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Rose common canker
Photo by: R.S. Byther