WSU Extension

Hortsense

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

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