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危害牧草的寄生性线虫有250种以上。它们当中有很多传播植物病毒,并增加真菌和细菌的危害,特别是根腐病。由于线虫对牧草的寄生,降低了施肥和灌溉的效果,引起作物在干旱和越冬时期的大量死亡。被线虫感染的植物用来喂饲家畜,要引起中毒。茎线虫(Ditylenchus dipsaci)是严重危害豆科牧草的线虫。它危害的植物有20多种。在苏联对红三叶的危害最强烈。苜蓿线
There are over 250 parasitic nematodes that are harmful to pasture. Many of them spread plant viruses and increase the damage of fungi and bacteria, especially root rot. The parasitic effects of nematodes on pasture have reduced the effectiveness of fertilizing and irrigating crops and have led to a large number of crop deaths during periods of drought and wintering. Nematode-infected plants are used to feed livestock and cause poisoning. Ditylenchus dipsaci is a nematode that is seriously damaging to leguminous pasture. It harms more than 20 kinds of plants. In the Soviet Union on the red clover the hardest. Alfalfa line