Host tree and borehole site selection by the ambrosia beetle Platypus quercivorus

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Host tree and borehole site selection by the ambrosia beetle Platypus quercivorus, the vector beetle of pathogenic fungi which cause Japanese oak wilt, were studied. A field study revealed that the effect of stem density on the probability of attack by P. quercivorus was positive at a small spatial scale, and negative at larger scales. A positive effect of attacked trees' density on the probability of mortality of attacked trees was also shown by a field study. Continuous observation of attacked trees revealed that P. quercivorus preferred the basal part of the tree as their borehole site in an early stage of attack, however, they changed the site of hole boring to the higher place with increasing density of holes at the basal part.