WSU Puyallup Ornamental Plant Pathology PPO

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PPO > Sudden Oak Death Research and Education Program > Sudden Oak Death > Information for Nursery Professionals > Managing Phytophthora diseases in the nursery > Incoming Plant Material > Questions to determine the likelihood of P. ramorum infection > Foliar Symptoms Caused by Phytophthora ramorum

Foliar Symptoms Caused by Phytophthora ramorum

top left: leaf blight of rhododendron - large lesion at the tip (bottom right of frame), small lesion at the base (top left of frame). Top right: leaf blight of camellia - two leaves next to each other, one with a large lesion at the tip, one with a small lesion on its left side. Bottom left: leaf blight of viburnum, a shoot with half the leaves dead. Bottom right: tip dieback of douglas-fir, which looks healthy until right before the topmost shoot where it has started to go brown and flopped over. — Leaf Blight examples

WSU Puyallup Research & Extension Center
2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated 9/24/2025