研究结果,红麻根结线虫二龄侵染幼虫主要分布在0—40cm土层内;砂壤土中的线虫量比黄壤土中的大,分布亦较深,前者可在80cm以下,而后者只在60cm以上土层。在冬闲季,卵和侵染幼虫主要群集在病残上;根际土中的越冬幼虫比根际外土中的多2倍以上。侵染幼虫量的波动在红麻生长季节有4个高峰,收获后还出现一个高峰。用免疫或高抗作物换茬轮作一年,病原线虫群体密度即大幅度下降。文中对该病防治理论基础作了讨论。 The results showed that the second instar larvae of root-knot nematode infection were mainly distributed in 0-40 cm soil layer. The amount of nematodes in sandy loam soil was larger than that in yellow soil, and the former was less than 80 cm while the latter only In more than 60cm soil. During winter and autumn, the eggs and the infestation larvae mainly clustered in the sick; the overwintering larvae in the rhizosphere soil were more than 2 times more than those in the rhizosphere. Fluctuations in the amount of infestation larvae in kenaf season has 4 peaks, after harvest there is also a peak. With immune or highly resistant crop rotation for one year, the density of pathogenic nematodes that is substantially reduced. The article discusses the theoretical basis of disease prevention.