PROBLEM TO BE SOLVED: To provide a wriggler exterminating composition, in which by inputting the wriggler exterminating composition to a rain water tank or the like in which a wriggler becomes verminous, allyl isothiocyanate as a Japanese horseradish component is diffused into water together with a water-soluble component while being emulsified in the water, and the wriggler is paralyzed with the allyl isothiocyanate as a Japanese horseradish component, and further, the large part of natural fat and oil is spread on the surface of the water without causing emulsification dispersion into the water to inhibit the respiration of the wriggler.SOLUTION: The wriggler exterminating composition is obtained by blending natural fat and oil, allyl isothiocyanate as a Japanese horseradish component and a water-soluble component compatible with both the allyl isothiocyanate and natural fat and oil.COPYRIGHT: (C)2012,JPO&INPIT【課題】 ボウフラが湧いた雨水槽等に本品を投入する事により、ワサビ成分のアリルイソチオシアネートが水可溶性成分と共に水中に乳化されながら水中に拡散され、ワサビ成分のアリルイソチオシアネートによりボウフラを麻痺させる、又天然油脂の大部分は水中に乳化分散されることなく水中表面に広がる事により、ボウフラの呼吸を阻害するボウフラ駆除組成物を提供すること。【解決手段】 天然油脂とわさび成分のアリルイソチオシアネート及びアリルイソチオシアネートにも天然油脂にも相溶する水可溶性成分を配合したボウフラ駆除組成物とする。【選択図】 なし