MEDETERA ALDRICHII (DIPTERA: DOLICHOPODIDAE) IN THE BLACK HILLS: II. BIOLOGY AND DENSITIES OF THE IMMATURE STAGES

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Abstract
Medetera aldrichii Wheeler larvae enter galleries of Dendroctonus ponderosae Hopkins through the beetle entrance holes. Observed larval densities of the fly were greatest in the May–June period following beetle attack. Densities were consistently greatest in the portion of the tree 5–10 ft aboveground; averaging around 3–4/sq. ft. The fly larvae probably cause a major share of the beetle mortality between August and the following May. The fly larvae pupate near beetle-created openings that lead from the galleries to the exterior.

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