线虫为无脊椎动物,隶属于线形动物门、线虫纲,一般为线状,体长通常不超过1毫米,宽20～30微米,有些种类的雌虫为近球形。线虫广泛分布于世界各个角落,椐统计约有50万种之多,其中植物线虫有200余属、4000多种。在我国,每一种植物至少有一种寄生线虫,许多作物受到不同程度的侵害,有些甚至是很严重的危害。据调查,我国水稻有13种病原线虫,玉米有8种,小麦有24种, Nematodes are invertebrates, belonging to the linear zoo, nematodes, generally linear, body length usually not more than 1 mm, width 20 to 30 microns, some types of females near spherical. Nematodes are widely distributed in all corners of the world, there are about 500,000 statistics, of which 200 species of plant nematodes, more than 4,000 species. In our country, there is at least one parasitic nematode for each plant, and many crops are infested to some extent and some are even very serious hazards. According to the survey, there are 13 kinds of pathogenic nematodes in rice, 8 kinds of corn, 24 kinds of wheat,