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Canker caused by Septoria musiva is an important and destructive disease of hybrid Poplars with Black, Balsam, and Cottonwood parentage, in the U.S.A. it has also been reported in Canada and Argentina. The fungus causes leaf spots on native Poplars, but these species are resistant to stem...

Waterman, A. M.
Circular. United States Department of Agriculture, 1954, No. 947, pp 24