Ecological Significance of Cold Hardiness and Winter Mortality of Eggs of the Gypsy Moth Lymantria dispar L. 1 , in Quebec

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Abstract
Measurements of the supercooling points of eggs of the gypsy moth, Lymantria dispar L. (Lepidoptera: Lymantriidae), collected in two sites in Quebec, at various levels above the ground, indicate that the species is well able to withstand the Quebec winter. A high percentage of egg masses were laid above snow cover level, but winter mortality was never higher than 39.7%. Winter mortality was, however, positively correlated with the length of exposure to low winter temperatures and to the degree of cold experienced, and these two factors were affected by a protective snow cover.

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