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Population densities of Bursaphelenchus xylophilus in the stems of dead 3-yrear-old larch and pine seedlings inoculated with nematodes through the maturation feeding of JPS adults. L, M, and U indicate the lower, middle, and upper part of the stem, respectively. Values are means (±SD) of nine dead larch seedlings and 12 dead pine seedlings. Bars indicate standard errors of the mean.
