Abstract
To evaluate the effect of adjacent tree species on the susceptibility of Japanese black pine (Pinus thunbergii) to pine wilt disease, an inoculation experiment was conducted using P. thunbergii seedlings potted with seedlings of six tree species, i. e. Alnus sieboldiana, Eurya japonica, Lespedeza bicolor form acutifolia, Pinus thumbergii, Robinia pseudo-acacia and Sarothamus scoparius. About ten months after planting, they were inoculated with the pinewood nematode (Bursaphelenchus xylophilus) in early July 1992. After that, the proportion of pine seedlings with completely discolored foliage increased more quickly when the seedlings were potted with R. pseudo-acacia, S. scoparius or A. sieboldiana than when potted with P. thunbergii, L. bicolor or E. japonica. At the end of the study period, 17 weeks after inoculation, it reached 90.6%, 90.0%, 87.5%, 72.7%, 63.3%, and 59.4% when the pine seedlings were potted with R. pseudo-acacia, S. scoparius, A. sieboldiana, P. thunbergii, L. bicolor and E. japonica, respectively. This indicated that the susceptibility of P. thunbergii seedlings to pine wilt disease was influence by the species of adjacent trees.
Published Version
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