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Differential spread of discoloured and non-conductive sapwood among four Fagaceae species inoculated with Raffaelea quercivora

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To reveal the relationship between the susceptibility of Fagaceae species to Raffaelea quercivora Kubono et Shin-Ito and the tangential expansion of regions of discoloured and non-conductive sapwood among the species, we inoculated branches of three Quercus species and one Castanopsis species with the fungus. The sapwood around the inoculation hole in all four species became non-conductive in response to the infection before the discolouration. The expansion of the region of non-conductive sapwood ceased within 2 weeks after the inoculation. The region of non-conductive sapwood in Q. crispula and Q. serrata was larger than that in Q. glauca and C. cuspidata var. sieboldii. These results suggest that the region of non-conductive sapwood expanded soon after the infection by R. quercivora. It was also clear that the transverse non-conductive sapwood has close relationship with the susceptibility among Fagaceae species to R. quercivora.

Document Type: Research Article


Affiliations: 1: Laboratory of Forest Pathology and Mycology, Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan 2: University Forest in Chiba, University Forests, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Kamogawa, Chiba 299-5503, Japan

Publication date: June 1, 2009


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