The Relation Between Host Condition and Attacks by the Bronzed Birch Borer

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Abstract
The bronzed birch borer, Agrilus anxius, was not found to be very aggressive. Adult beetles were attracted to and attacked the decadent trees. Those most decadent, i.e., having ceased producing radial increment, were the most suitable for the successful development of the larvae. Trees which were completely dead (inner bark brown) were unsuitable for larval development. Apparently the bronzed birch borer becomes abundant only when there is a plentiful supply of dying trees.

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