Abstract
In order to examine development of the infection with Amylostereum sp. and of the fungus in the wood, inoculations with the fungus were conducuted onto stems of living and felled tree of Cryptmeria japonica and Chmaecyparis obtusa. Wood stain which was similar to that on naturally Amylostereum infected trees developed around all the inoculated points of living stems. The average extent of the stain expanded vertically, 50 to 60cm and 70cm on woods of Cr. japonica and Ch. obtusa, respectively, three months after inoculation and the infection with the fungus was evaluated to develop largely in a short period. No wood stain expanded on most logs of felled trees except on some logs at three months after inoculation. Reisolation frequencies of the inoculated fungus were high in most stained woods of living stems and in some no-stained woods of felled trees. Trichoderma sp. and Marasmiellus chamaecyparidis were isolated with high frequency from some logs in which reisolation frequency of the inoculated fungus was low and fungal flora in the log was assessed to success.
