Response of Japanese Red Pine to Inoculation with a Blue Stain Fungus, Ceratocystis piceae

概要

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To confirm the pathogenicity of a blue stain fungus, Ceratocystis piceae (Munch) Bakshi to the Japanese red pine (Pinus densiflora Sieb. et Zucc.), the responses of healthy young pine trees and stressed trees which were girdled by the half-circumferential girdling technique were investigated by the fungal inoculation test. Although neither of the pine trees inoculated with C. piceae in the non-girdled treatment nor the controls died, mortality of the trees girdled and inoculated with C, piceae was 28.69%. In the pine trees inoculated with C. piceae, the mean area of the necrotic lesion of the sapwood was significantly larger than that of the controls, and the mean of the water pressure potential of the xylem decreased, regardless of the girdling treatment. The C. piceae was reisolated from the wood pieces near the inoculation points on the inoculated trees, but not from the controls. These results suggest that under strongly stressed conditions, the Japanese red pine trees might have been killed by heavy infestations of C. piceae carried by bark beetles.
一般社団法人日本森林学会の論文
1996-02-16