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A Record of Winter Kill of Western Pine Beetle in California, 1932

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The effect of climate upon the abundance of insect life in the forest is a factor in ecology that can rarely be measured by quantitative methods. In the following article, however, is a record of the sudden depletion of the bark beetle population over a large area in the Modoc National Forest due to low temperatures but a few degrees below those which normally occur in winter in that region. Following a cold spell in December, 1932, 65 per cent of the western pine beetle broods were found to be dead. This resulted in the closing down of a control project and will undoubtedly have a large either upon the future course of the bark beetle epidemic which has been developing in that region.
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Document Type: Journal Article

Affiliations: U. S. Bureau of Entomology, Berkeley, Calif.

Publication date: 01 April 1933

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