甘薯是山东、河北、河南等北方地区的重要作物。当前甘薯生产亟待解决的突出问题是防治分布广泛的甘薯茎线虫病（ Ditylenchus destructor Thovne），俗称糠心病，受害甘薯一般减产 20％～ 30％，严重的达 70％～ 80％，甚至绝收，是甘薯上的一种毁灭性病害。为此我们自 1990年 Sweet potato is an important crop in Shandong, Hebei, Henan and other northern regions. The current urgent problem to be solved in the production of sweet potato is the control of the widely distributed sweet potato stem nematode disease (Ditylenchus destructor Thovne), commonly known as chai heart disease, the affected sweet potato generally reduced by 20% to 30%, severe 70% to 80% A devastating disease on sweet potatoes. To this end we since 1990