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adjacent trees affected by elm American elm appear areas butterscotch discoloration buttress roots Circular 305 color control of phloem current season growth Dayton and Columbus dead trees destruction discolored inner bark discolored layer disease occurs Diseased elms diseased trees dying of elms early symptoms elm phloem necrosis elm resistant elms are resistant epidemic developed healthy trees holly leaf identification of phloem Infected elms infected trees insect that transmits insecticides Kansas City Kentucky layer of inner leaf hopper leaf symptoms cause Louis Missouri counties moline natural root grafting necrosis of elm necrosis was identified observed occurs between roots odor of wintergreen Ohio Oklahoma partial defoliation prevent probable resistant to phloem roots of adjacent Siberian Chinese slippery elm species of elm susceptible to phloem suspected trees symptom of phloem T. W. Bretz thin layer tissue transmission trunk unpredictable number varieties vase virus disease winged elm yellow to butterscotch yellowing and falling