Abstract
Borings of Platypus quercivorus on Fagaceae trees (13 species) were investigated from 2009 to 2010 in the Kyoto Gyoen National Garden which is located in an urban area in Kyoto Prefecture, Japan. 342 trees were bored by P. quercivorus which was supposed to invade from outside, and 71 trees died among them. The bored trees were widely dispersed in the garden. The boring was confirmed in 12 species, and dead trees were found in 9 species. Correlations cannot be found between the rate of trees being bored and the rate of dead trees among bored trees, whereas the former was high in Lithocarpus glaber and low in L. edulis, while the latter was high in L. edulis and low in L. glaber. The rate of dead trees among bored trees was higher when the density of entry holes was higher in L. edulis, Castanopsis sieboldii and Quercus glauca. L. edulis was most liable to death in the same density levels. It was suggested that protective measures were necessary for bigger diameter trees which die more frequently in many species.
