title: The Effect of Raffaelea quercus-mongolicae Inoculations on the Formation of Non-conductive Sapwood of Quercus mongolica.
abstract: In Korea, mass mortality of Quercus mongolica trees has become obvious since 2004. Raffaelea quercus-mongolicae is believed to be a causal fungus contributing the mortality. To evaluate the pathogenicity of the fungus to the trees, the fungus was multiple- and single-inoculated to the seedlings and twigs of the mature trees, respectively. In both the inoculations, the fungus was reisolated from more than 50% of inoculated twigs and seedlings. In the single inoculations, proportions of the transverse area of non-conductive sapwood at inoculation points and vertical lengths of discoloration expanded from the points were significantly different between the inoculation treatment and the control. In the multiple inoculations, no mortality was confirmed among the seedlings examined. These results showed that R. quercus-mongolicae can colonize sapwood, contribute to sapwood discoloration and disrupt sap flows around inoculation sites of Q. mongolica, although the pathogenicity of the fungus was not proven.
authors: Graduate School of Bioresources, Mie University, Tsu 514-8507, Japan.
authors: Masato
authors: M
authors: Torii
authors: Graduate School of Bioresources, Mie University, Tsu 514-8507, Japan.
authors: Yosuke
authors: Y
authors: Matsuda
authors: Division of Forest Insect Pests and Disease, Korea Forest Research Institute, Seoul 130-712, Korea.
authors: Sang Tae
authors: ST
authors: Seo
authors: Division of Forest Insect Pests and Disease, Korea Forest Research Institute, Seoul 130-712, Korea.
authors: Kyung Hee
authors: KH
authors: Kim
authors: Mie University, Tsu 514-8507, Japan.
authors: Shin-Ichiro
authors: S
authors: Ito
authors: Department of Biological Sciences, Dankook Unversity, Cheonan 330-714, Korea.
authors: Myung Jin
authors: MJ
authors: Moon
authors: Department of Microbiology, Dankook Unversity, Cheonan 330-714, Korea.
authors: Seong Hwan
authors: SH
authors: Kim
authors: Graduate School of Agricultural and Life Scieneces, The University of Tokyo, Tokyo 299-5503, Japan.
authors: Toshihiro
authors: T
authors: Yamada
keywords: Discoloured sapwood; Non-conductive sapwood; Pathogenicity; Quercus mongolica; Raffaelea quercus-mongolicae