我国很早以前就有人利用苦楝籽等作为驱虫灭虫的原料.近几年国外也有研究利用苦楝籽油作为害虫拒避剂保护农作物的报道.苦楝籽中一般含油率在8%左右,经压榨后苦楝籽饼中仍残留油份4%左右.为了摸清苦楝籽饼对甘薯茎线虫病的防治作用,1983年我们利用苦楝籽饼和其他农药在甘薯苗床及大田进行了茎线虫病防治试验. In our country, some people used the seeds of dendritic pests for insect repellent long time ago, such as neem seeds, etc. In recent years, there are also some reports about the use of neem seed oil as a repellent to protect crops in the world. The average oil content in the seeds is about 8% In addition, the bitter neem seed cake still remained about 4% of oil content after crushing .In order to find out the prevention and treatment effect of the neem seed cake on the sweetpotato stem nematode disease, we used the neem seed cake and other pesticides to control the stem nematodes in 1983 test.