Estimates of net brood production can provide an additional aid for stand prioritization since the stand susceptibility index explains little of the variation in net brood production (Fig. 3). The largest trees contributed most, per tree, to the discrepancy between net brood production and stand susceptibility rating (Fig. 4). For example, a 35 cm DBH tree have a basal area that is approximately twice as large as a 25 cm DBH tree whereas the net production of beetles is more than three times as high in a 35 cm DBH tree compared to a 25 cm DBH tree. Thus, the higher the proportion of a stand that is made up of large trees the larger the discrepancy between net brood production and stand susceptibility.