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 r6le than do the insect parasites and fungus diseases.
Document Type: Research Article
Publication date: April 1, 1928
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.