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线虫属于无脊椎动物线形门线虫纲,约有50万种之多,大多在土壤和水中营自由生活或腐生,约10%寄生于动植物。植物线虫约90%以上在土中、根内或根围完成生活史,为害茎、叶、花、种子者亦多先在土内(常常是寄主残体中)生活一段时间,待寄主开始生长和条件适宜时沿植株上移,并在其中成熟;为害表症又往往与病灶不在一起,以致不易准确诊断而误作其它,常被忽视。植物线虫最早于1943年 Needham 从小麦瘿粒中镜检出粒瘿线虫(Anguina tritici)
Nematodes are invertebrate nematodes, about 500,000 species, mostly living in soil and water camp or saprophytic, about 10% parasitic on plants and animals. More than 90% of the plant nematodes in the soil, root or within the circumference to complete the life history of the damage stems, leaves, flowers, seeds and more first in the soil (often the host remains) for some time, until the host began to grow And when the conditions are appropriate, the plants move upwards and mature therein; the disease-causing symptoms are often not together with the lesion, so that it is not easily diagnosed correctly and misused as others and is often overlooked. Nematode as early as 1943, Needham from the wheat grain particles microscopic Nematode (Anguina tritici)