Ramorum Blight, Phytophthora ramorum—symptoms on common landscape plants
© Joseph O’Brien, USDA Forest Service, Bugwood.org
© Everett Hansen. Source: pnwhandbooks.org
© Jennifer Parke. Source: California Oak Mortality Task Force (COMTF)
Clockwise from top left: foliar discoloration is common where water collects on the leaf, often at leaf tips (California bay, images 1–2); necrosis
along midrib; lesions penetrate leaf—identical pattern front/back; leaf symptoms prominent where water collects (rhododendron, images 3–6).
© J. O’Brien, USDA-FS, Bugwood.org
© J. O’Brien, USDA-FS, Bugwood.org
© S. A. Tjosvold, UC Cooperative Extension
© S. A. Tjosvold, UC Cooperative Extension
© Cheryl Blomquist, California Dept. of Food and Agriculture
© S. Ashby, DEFRA, UK. Source: plant management network
© PHSI, DEFRA, UK. Source: www.ndrs.org
©Joseph O’Brien, USDA Forest Service, Bugwood.org
© B. Jones, Forestry Commission, UK. Source: COMTF
© Oregon Department of Agriculture
Clockwise from top left: leaf infection spreads along petiole into stem forming a canker (rhododendron); foliar symptoms on camellia;
on kalmia; on andromeda; tip blight on viburnum; foliar discoloration on Japanese larch; wilting which leads to twig blight (Douglas fir).
For more information on ramorum blight visit www.suddenoakdeath.org/.
Find more at www.firstdetector.org