Crown Gall Tree Disease

Crown Gall

Symptoms

  • Crown Gall tree disease or overgrowth (1/4 inch to several inches in diameter) of host plant tissue typically form at the soil line but also can form on branches or roots.
  • Galls are initially white, round, and soft but darken with age as outer cells die.
  • Galls can either be almost entirely on the surface of the plant and easily detached or can be almost indistinguishable from normal plant tissue except for its greatly enlarged appearance.
  • The bacterium survives and persists in the soil for many years. It attacks recent wounds on stems or roots. Swelling can be seen within 14 days. Tissue near the gall is crushed. If vascular tissue is crushed, wilting can result from the lack of water movement.

 


Management

Crown Gall

  • Plant only Crown Gall free plants to reduce risk of disease.
  • Remove severely affected plants and do not replace with susceptible cultivars.
  • Plants not severely affected can be grown if fertilized, watered, and cared for properly. The disease will continue but probably not kill the plant.

 


Woody Ornamentals that are resistant to Crown Gall

  • Abelia
  • Serviceberry
  • Barberry
  • Birch
  • Boxwood
  • Cedar
  • Redbud
  • Smoke Tree
  • Deutzia
  • Holly
  • Larch
  • Magnolia
  • Spruce
  • Sumac
  • Elderberry
  • Hemlock

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