Einar W. Palm Department of Plant Pathology Wilfred S. Craig Department of Entomology Phloem necrosis of American elm is a disease of unknown origin of many years standing, which is now widespread

Elm phloem necrosis is prevalent in the eastern U.S. It kills more elms than Dutch elm disease in many urban areas. Keywords: mycoplasma, leafhopper, wilted leaves, chlorotic leaves, curled margins

Synonyms elm yellows phytoplasma Plant hosts The only known hosts are elms (Ulmus spp.) including the American species U. americana, U. rubra, U. alata, U. serotina, U. crassifolia, and the

United States Department of Agriculture Forest Service NA-FB/P-11 1981 Figure 3. Nymph of whitebanded leafhopper, vector of elm phloem necrosis. Dutch elm disease (DED) and elm phloem necrosis a