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WSU Puyallup The Key to identifying a Phytophthora ramorum infestation
PPO Home > WSU Sudden Oak Death Program > Education Program > Information for Nursery Professionals > Managing Phytophthora diseases in the nursery > Incoming Plant Material > Questions to determine the likelihood of P. ramorum infection

Questions to determine the need to submit a homeowner sample in Washington State

1) The plant displays leaf blight, defoliation, or stem die back symptoms similar to those shown in the photographs.
a. Yes- go to 2
b. No- Sample can be discarded
2) What plant is affected?
a. The plant is a camellia, rhododendron, pieris, kalmia, viburnum, or lilac purchased since 2002- Submit sample
b. The plant is growing next to a camellia, rhododendron, pieris, kalmia, viburnum, or lilac purchased since 2002- go to 3
c. None of the above- unlikely P. ramorum. Sample can be discarded.
3) Is the plant a known host of Phytophthora ramorum?
b. Sample can be discarded
 

Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center, 2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated January 2, 2013