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Washington State University
WSU Puyallup Ornamental Plant Pathology

Intensively sampled sites

Three sites were chosen to test whether there is a difference between Rhododendron species used as leaf baits. The sites were First Creek (1004), Puget Creek (1005), and Clarks Creek headwaters (1007) Rhododendron macrophyllum and R. ‘Nova Zembla’ were compared. More samples per site were collected to better evaluate Phytophthora species diversity.

Sites were monitored for one baiting period using 40 bait leaves, 20 from each Rhododendron species. Two samples per leaf were isolated and identified, for a total of 80 per site.

There were no differences in Phytophthora species isolated from the two types of bait leaves, however there were significant differences among sites.