Pacific Northwest Plant Disease Management Handbook

Black Locust (Robinia spp.)-Fusarium Canker

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Latest revision: 
March 2026
Image related to Black Locust (Robinia spp.)-Fusarium Canker

Fusarium canker on Purple Robe Black Locust.

Sam Doane, 2008.

See:

Honey Locust (Gleditsia spp.) - Canker

Note: The disease occurs in PNW nurseries, and the cultivar Purple Robe is susceptible. In Europe, several Fusarium spp. have been found. Fusarium sulphureum and F. avenaceum caused cankers (necrosis in living bark and phloem) on stem and twigs without wounding.

Reference Halász, G. 2002. Canker and wilt of black locust (Robinia pseudoacacia L.) caused by Fusarium species. Acta microbiologica et immunologica hungarica, 49:249-260.

Pscheidt, J.W., and Ocamb, C.M. (Senior Eds.). 2026 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.