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: Crown gall
Photo by: R.S. Byther
  
Rose : Crown gall
(revision date: 4/23/2014)


Biology
Crown gall on roses usually occurs at or just beneath the soil surface. It may also be found on stems and roots. Young galls appear as a soft thickening in stems or roots and are green to white in color. Older galls are woody, dark and corky-looking on the outside, and light-colored on the inside. The bacterium that causes crown gall is present in the soil and infects through wounds on the roots or stem. It can be spread from infected soil by water movement. Damage to plants varies with location and size of galls.
Management Options


Non-Chemical Management
  • Plant disease-free materials.
  • Avoid wounding roots and crown when planting or cultivating.
  • Wash hands and disinfect pruning tools frequently.
  • Remove and destroy infected plants. Also remove roots and surrounding soil where possible.
  • Replant only resistant species in infected soil.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Crown gall
Photo by: R.S. Byther