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Washington State University
WSU Puyallup Ornamental Plant Pathology

Long term sites

Each site had two bait bags containing 10 leaves/sampling period. Bait leaves used were Rhododendron ‘Nova Zembla’ and a ‘wild card’ species of choice. Leaves were sliced in several locations along the midrib to allow for better colonization by Phytophthora. See individual sites for more detailed results. Of these ten leaves, five leaves were cultured and two isolates per leaf were identified using PCR-RFLP and sequencing if necessary, for a total of 10 samples per baiting period. Phytophthora gonapodiydes was found the most often. Unknowns are being sequenced.

1001 – Clarks Creek Downstream

1002 – Anderson Creek

1003 – Evans Creek

1006 – Dogfish Creek


Phytophthora species isolated from ‘wild card’ plants

Temperature data

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