In the face of this new invader, Asian pine trees do not know how to respond. Furthermore, artificially introduced species are often propagated from only a few individuals, and this inbreeding leads to a restricted gene pool. This has favored the swift growth of the nematode population in Asia.
面對外來、前所未有的敵人，亞洲松樹反應不及，加上人工引種通常只由幾株母樹繁衍，近親繁殖，種源衰弱，線蟲族群遂快速發作。