The Influence of Small Mammals and Other Factors Upon the Larch Sawfly Survival

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Abstract
This paper presents the results of a series of quantitative studies and experiments concerning the factors that influence mortality of the larch sawfly, Lygaeonematus erichsonii, in the cocoon stage. Facts are presented to show that the physical conditions that exist in the sphagnum moss in tamarack swamps are much more favorable for hibernation of the sawflies than are the conditions that are to be found under tamarack on high ground. Of the biotic factors that operate to reduce the numbers of the sawfly in the cocoon stage small mammals, particularly mice, play a much more important rôle than do the insect parasites and fungus diseases.

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