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Ash dieback (Chalara fraxinea) is a fungus spread by the wind.
B. L. Shearer has written:
'Jarrah dieback' -- subject(s): Control, Jarrah dieback, Phytophthora cinnamomi
S. J. Michaels has written:
'Dieback'
your ash tree has a disease called ash tree dieback or chalara
F. E. Batini has written:
'Jarrah dieback, a disease of the Jarrah Forest of Western Australia'