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我省在1980年发现了大豆孢囊线虫病,经过1980—1986年的研究。发现该线虫以雌虫的孢囊在土壤中越冬,第二年月中下旬孵化出第一代的二龄幼虫,然后幼虫进入大豆根中寄生。第一代幼虫孵化较整齐.数量多,此时正值大豆幼苗期,根系幼嫩,受害最为严重,可引起成片枯死。该线虫在我省晋中地区年发生四代,后期世代有重迭现象,九月中下旬后,以第四代的雌虫孢囊越冬。该线虫主要分布在15cm以上的耕作层,降雨对线虫的垂直分布影响很大,雨后线虫下
Soybean cyst nematode disease was found in 1980 in our province, after 1980-1986. The nematode was found to overwinter in the soil with female cysts and the second instar second-instar larvae were hatched in the second and second months of the month, after which larvae entered the soya root. The first generation of larvae hatch more neat. The number of more, at this time positive soybean seedling stage, young roots, the most serious victims, can cause into pieces withered. The nematodes in Jinzhong area in our province occurred in four generations, the late generation of overlapping phenomenon, in late September, with the fourth generation of female cysts wintering. The nematodes are mainly distributed in the tillage layer above 15cm. Rainfall has a great influence on the vertical distribution of nematodes. After the rain nematode