Abstract
Scolytus multistriatus attack density, gallery length, and brood production beneath the bark of Ulmus procera branches 2 to 6 cm in diameter increased as branch diameter increased. Beetles did not complete development in 2-cm-diameter branches, and an average of 70 beetles per dm2 emerged from 6-cm-diameter branches. Removal of small-diameter, moribund branches above 2 cm in diameter may be necessary if all potential breeding sites are to be eliminated in Dutch elm disease prevention programs.
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