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The pine wood nematode (PWN), Bursaphelenchus xylophilus, is a disastrous pathogen of the pine forests in East Asia and Europe. Plant quarantine is one of the most important ways to prevent its infection in current situation. A nested polymerase chain reaction (PCR) assay targeting the topoisomerse I gene has been developed to detect PWN in this study. To assess the specificity of the assay, 44 morphologically...