| molecular characterization of portuguese populations of the pinewood nematode bursaphelenchus xylophilus using cytochrome b and cellulase genes. | bursaphelenchus xylophilus is the causal agent of pine wilt disease and a worldwide pest with high economic impact. since its first diagnosis in portugal in 1999, it has been subjected to quarantine measures with impact on forest health and ecosystem stability, significantly affecting international trade of wood products. the disease was detected in the north and centre of continental portugal and, since 2008, the whole country has been considered an affected area. recently, it was detected in m ... | 2013 | 23067571 |