摘要：The mass mortality of Quercus serrata has been progressing in the area of coppice woods of Yokkaichi University. The field survey has been conducted to draw up its measures. The results show the number of individuals of DBH more than 3.0 cm was 321 and the 18.1% of them were dead and those with the perforations of Platypus querciuorus occupied about half of them. The number of dead trees and live ones with the perforation increase in proportion to the increase of DBH. The ratio of dead trees with DBH more than 50cm was as high as 35.7%. The investigation of the age distribution and that for the regenerated individuals by a coppice show more than half of all Q. serrata were under pressure for cropping (DBH>10cm) until late 1980’s, the starting time of construction of the university. This means the age distribution is under the effect of artificial felling as well as the mass mortality caused by P. querciuorus .
