An Instance of Delayed Emergence of the Douglas-Fir Beetle and Its Effect on an Infestation in Southern Utah

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Abstract
A long-term infestation of Douglas-fir beetle in southern Utah was terminated by failure of brood to emerge in 1962. The weather seemed responsible for brood remaining in the infested trees for 2 winters. The proportions of brood stages entering fall became progressively more immature over a 4-year period prior to the decline.

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