THE PRESENT STATUS OF THE LARCH SAWFEY, (LYGAEONEMATUS ERICHSONII HARTIG), IN CANADA, WITH SPECIAL REFERENCE TO ITS SPECIFIC PARASITE, MESOLEIUS TENTHREDINIS MORLEY

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Abstract
One of the most outstanding instances of the benefits to be derived from the importation of parasites of our injurious insects, be they of foreign or domestic origin, is to be found in a study of the Larch Sawfly situation in Canada, especially in Manitoba, during the past twenty years.