Attack and Brood Production of Ambrosia Beetles in Logging Debris

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Abstract
The ambrosia beetle, Trypodendron lineatum (Oliv.), causes extensive damage to logs in coastal British Columbia. The logging debris or slash felled in the autumn has been found to be an important breeding place for these beetles. The shaded sides of the larger pieces of slash sustained the greatest attacks and produced the most brood. The population increased about four-fold as a result of breeding in slash and this increase was estimated to be more than one quarter of a million beetles per acre on the areas investigated. A very large population of these beetles can develop each year in districts where autumn and winter felling is in progress.