In recent years the following species have been reported on a range of trees: horse chestnut and sweet chestnut affected by P. cambivora, and Oak, beech and tulip tree affected by P ramorum and P. kernovii. Symptoms of the problem involve a dark ooze coming from the bark. After peeling away the outer bark, deep red, dead patches of inner bark are seen, often with a sharp distinction between dead and living bark. Oaks may be suddenly killed by P. ramorum. Control is at the moment limited to scraping away the outer bark in hot weather to allow drying and healing of tissues.
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