线虫,是一种极小的蠕虫,林业上除苗圃外,一般不作为重要的林木病原物考虑。土壤中发现的林木病原线虫,虽大多数可使林木生长逐渐下降,但不致于引起林木迅速死亡。然而,最近在美国发现的松材线虫,使病理学家不得不改变原来的观点。在日本,这种病害已使森林造成了 Nematodes, is a very small worm, forestry except nurseries, generally not considered as an important forest pathogen. Forest pathogen nematodes found in soil, although most can make the growth of forest trees gradually decline, but will not cause rapid death of trees. However, the recent discovery in the United States of pine wood nematodes, so pathologists have to change the original point of view. In Japan, the disease has caused the forest