甘薯旋花天蛾,在我省淮北地区一年发生三至四代,食量大,老熟幼虫抗药力較强,极易造成甘薯減产。但使用目前介紹的农药防治,不仅耗药量大、成本高,而且对四龄以后的老熟幼虫药效很不理想。1964年9月,我們鉴定和試驗了怀远县界沟公社群众創造的滴滴涕煤油合剂防治甘薯旋花天蛾的办法,并在去秋、今夏进行了推广。滴滴涕煤油合剂的配制和使用方法是:用一斤25%的滴滴涕、一斤煤油,加水四百斤,混合成稀释液,噴于甘薯苗上。防治四龄以前的幼虫,四百斤稀释液可喷十五 Sweet potato Convolvulus, moths, occurred in Huaibei in our province three to four generations a year, food intake, mature larvae strong resistance, can easily lead to sweet potato production. However, the use of currently introduced pesticide control, not only consume large quantities, high cost, but also the efficacy of mature larvae after the age of four very unsatisfactory. In September 1964, we identified and tested the DDT-kerosene mixture that was produced by the community of Jigou commune in Huaiyuan County to prevent and cure sweet-scented twig moths. In autumn, this summer we conducted a promotion. Preparation and use of DDT kerosene mixture is: a pound of 25% DDT, a pound of kerosene, add water four hundred pounds, mixed into a diluent, spray on the sweet potato seedlings. Four years before the control of larvae, four pounds of dilution can spray fifteen