ELM YELLOWS
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Elm

SOURCE:
W. Sinclair
DISEASE:
Elm yellows
HOST:
Elm
(Ulmus americana)
Branches with butterscotch discoloration (center) and necrotic flecks in phloem and vascular cambium (right). Healthy branch (left). Sudden wilt and browning is common with small trees.
PATHOGEN:
'Candidatus Phytoplasma ulmi'
PATHOGEN SYNONYM:
Phytoplasma Elm yellows group