Pacific Northwest Plant Disease Management Handbook

Canker

  • Facebook logo
Latest revision: 
March 2024
Canker on apple

Cankers on side of this 'Golden Delicious' apple branch show how the bark becomes detached.

Photo by Jay W. Pscheidt, 2000.

Death of cambium tissue and loss and/or malformation of bark; or by the formation of sharply delineated, dry, necrotic, localized lesions on the stem; the term canker also may be used to refer to the lesion itself, particularly in woody plants.

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2024 Pacific Northwest Plant Disease Management Handbook.
© Oregon State University.

Use pesticides safely!

  • Wear protective clothing and safety devices as recommended on the label. Bathe or shower after each use.
  • Read the pesticide label—even if you’ve used the pesticide before. Follow closely the instructions on the label (and any other directions you have).
  • Be cautious when you apply pesticides. Know your legal responsibility as a pesticide applicator. You may be liable for injury or damage resulting from pesticide use.

Trade-name products and services are mentioned as illustrations only. This does not mean that the participating Extension Services endorse these products and services or that they intend to discriminate against products and services not mentioned.

H - Home garden packaging commonly available.     O - Acceptable in organic production.