Winter Mortality of Larvae of the European Pine Shoot Moth, Rhyacionia Buoliana Schiff., in Connecticut

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The severity of the winter of 1933–34 in contrast with the two previous winters afforded the writer the opportunity of observing the effect of winter temperatures on the survival of larvae of the European pine shoot moth. These observations are included here together with the results of some laboratory experiments on lethal low temperatures. An explanation is suggested for the course of development of the shoot moth outbreak since the introduction of the insect into Connecticut in 1914.