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Different Incidences of Pine Wilt Disease in Pinus densiflora Seedlings Growing with Different Tree Species

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Field-grown Japanese red pine (Pinus densiflora) seedlings were inoculated with the pine wood nematode (Bursaphelenchus xylophilus) in early July 1991 to clarify the effect of co-occurring tree species on the susceptibility of P. densiflora to pine wilt disease. Sixteen weeks after inoculation, 48, 33, 14, and 18% of pine seedlings were diseased when they grew with Alnus sieboldiana, with Sarothamus scoparius, with the naturally associated species of P. densiflora such as Ilex pedunculosa and Eurya japonica, and in a pure stand of P. densiflora, respectively. When associated with A. sieboldiana or S. scoparius, pine seedlings quickly had visual discoloration of foliage. Twenty percent of P. densiflora seedlings treated with water died within 6 months when growing in the stand with A. sieboldiana, suggesting that the seedlings were stressed. The susceptibility of P. densiflora seedlings to pine wilt disease was enhanced by the different tree species co-occurring with the seedlings. For. Sci. 41(4):841-850.

Keywords: Bursaphelenchus xylophilus; inoculation experiment

Document Type: Journal Article

Affiliations: Assistant Professor, Laboratory of Applied Botany, Faculty of Agriculture, Kyoto University, Kyoto 660, Japan

Publication date: November 1, 1995

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