Abstract
IN the autumn of 1930, serious defoliation of some 2,000 square miles of spruce forest by a species of sawfly was discovered in the interior of the Gaspé Peninsula, Province of Quebec, Canada. This has now increased to about 8,000 square miles of heavy infestation. The insect, previously unreported in America, was identified as Diprion polytomum Hartig, a species known in Europe for more than a hundred years.
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SMITH, S. Cytology of Spruce Sawfly and its Control in Eastern Canada. Nature 141, 121 (1938). https://doi.org/10.1038/141121a0
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DOI: https://doi.org/10.1038/141121a0
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