LEAF AND SHOOT BLIGHT OF POPLARS (SECTION TACAMAHACA SPACH) CAUSED BY VENTURIA POPULINA (VUILL.) FABRIC

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Abstract
This study is concerned with the recognition, pathology, and taxonomy of Venturia populina (Vuill.) Fabric. (= Didymosphaeria populina Vuill.), and its imperfect stage Pollaccia elegans Serv., which is shown to cause a leaf and twig blight of balsam poplar (Populus balsamifera L.) in North America. Venturia populina may be confined to hosts of the section Tacamahaca Spach of the genus Populus, although experimental evidence presented here suggests that poplars of the section Aigeiros Duby also may be susceptible, as they are in Europe. The binomial Fusicladium radiosum (Lib.) Lind, which was listed by Servazzi as a pro parte synonym of P. elegans, is shown to have been commonly applied in North America to the fungus representing Pollaccia radiosa (Lib.) Bald. & Cif., a pathogen which is confined to poplars of the section Leuce Duby in both Europe and North America. Fusicladium radiosum (Lib.) Lind var. balsamiferae J. J. Davis, however, is shown to be a synonym of P. elegans.

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