Pacific Northwest Plant Disease Management Handbook

Hemlock (Tsuga spp.)-Heterobasidion Root Disease

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Latest revision: 
March 2024
Image related to Hemlock (Tsuga spp.)-Annosus Root Disease
Note the staining of the wood. The wet looking outer area was 'wetwood' where no decay fungi were present. The blackish central area and dark stain within the wetwood is where the fungus was cultured.
Dave Shaw

See:

Fir, True (Abies spp.) - Heterobasidion Root Disease

Note Heterobasidion root rot is mostly a butt or trunk rot in hemlock that becomes important when trees are 60 to 80 years old.

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.