Abstract
The disease was first observed at Bear Island, Lake Temagami, Ontario, during the summers of 1930-1931, when it was found on young trees of Populus grandidentata Michx., P. tacamahaca Mill. and P. tremuloides Michx. Later it was found on the same species of poplars in other places in the Temagami Forest Reserve. The affected trees were from three to six years old and usually not over 1.5 inches in diameter.
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