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Population densities of Bursapelenchus xylophilus in the stems of 2-year-old larch seedlings inoculated with a water suspension of cultured nematodes (grown on Botrytis cinerea). L, M, and U indicate the lower, middle, and upper part of the stem, respectively. Values are means (±SD) of three seedlings at 3, 9, and 15 days; 12 seedlings at 21 days; and 21 seedlings at 28 days after inoculation.
