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Mortality of Japanese black pine seedlings (Pinus thunbergii) 5 wk after inoculation with four isolates of pinewood nematodes, Bursaphelenchus xylophilus (Portuguese isolates HF and T, Japanese virulent isolate S10, and Japanese avirulent isolate C14-5). *There is no difference between two isolates followed by the same letter (Tukey's WSD method, α = 0.05).
