Temperature relationships of a blight attributed to Fusarium solani (Mart.) Sacc. on Trembling Aspen suckers

During experimental studies on the suckering response of trembling aspen (Populus tremuloides Michx.) to different temperature regimes and in darkness, it was observed that necrotic lesions developed on the leaves and stems of young suckers. Isolations from these lesions consistently yielded the fungus, Fusarium solani (Mart.) Sacc. (we are grateful to Dr. C. Booth, Kew, Surrey, and to Professor R. F. Cain, Department of Botany, University of Toronto, who identified the isolates of the suspected causal organism). This fungus has been reported to cause cankers in Populus deltoides Marsh. (Boyer, M.D.. Can. J. Botany 39: 1195- 1204, 1961)