Pacific Northwest Plant Disease Management Handbook

Susceptibility of Conifer Seedlings to Phytophthora Root Rot

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Reviewed: March 2023

Susceptibility of Conifer Seedlings to Phytophthora Root Rot*

Highly Tolerant

Western Redcedar

Lodgepole Pine

Ponderosa Pine

Western Larch

Tolerant

Incense Cedar

Sitka Spruce

Engelmann Spruce

Western White Pine

Sugar Pine

Susceptible

White Fir

Grand Fir

Pacific Silver Fir

Douglas-fir

Highly Susceptible

Mountain Hemlock

Western Hemlock

Noble Fir

California Red Fir

* Reference Campbell, S.J. and Hamm, P.B. 1989. Susceptibility of Pacific Northwest conifers to Phytophthora root rot. Tree Planters’ Notes 40:15-18.

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.