The Number of Larval Instars and the Approximate Length of the Larval Stadia of Dendroctonus Pseudotsugae Hopk., with a Method for Their Determination in Relation to other Bark Beetles

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Abstract
Investigators encounter considerable difficulty in studying the development and habits of larvae which mine beneath the bark of trees. A method is here outlined whereby such a study can be accomplished, and its application is demonstrated in the case of the Douglas-fir beetle (Dendroctonus pseudotsugae Hopk.). The usefulness of this information in a thorough study of larval parasites and its value in the economic control of the Douglas-fir beetle are shown.

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