The present invention provides a pesticidal material for heat transpiration and a method for controlling pests by heat transpiration that enable to provide a stable transpiration and thus a stable pesticidal effect. A pesticidal material for heat transpiration which has an aqueous pesticidal composition comprising a pesticidal active ingredient, glycol ether and water, and a liquid-absorbing wick that is set up so as to be dipped into the composition, the glycol ether content in the composition and the porosity of the wick satisfying the following equation: Equation: 0.17 ≦ a/b ≦ 2.5, wherein the 〝a〞 represents the glycol ether content (wt%) in the composition and the 〝b〞 represents the porosity (%) of the wick.本發明提供一種用於熱蒸散之殺蟲材料及一種藉熱蒸散防治害蟲之方法,其能夠提供一種穩定的蒸散及因而提供穩定的殺蟲作用。一種用於熱蒸散之殺蟲材料,其具有一種包含殺蟲活性成分、二醇醚和水之水性殺蟲組成物,及安裝成浸入組成物中之吸液芯,在組成物中的該二醇醚含量及該芯之孔隙度符合下列方程式:方程式:0.17≦a/b≦2.5,其中該"a"表示在組成物中的該二醇醚含量(wt%)及"b"表示該芯之孔隙度(%)。1‧‧‧表示水性殺蟲組成物2‧‧‧表示環狀加熱器3‧‧‧表示吸液芯4‧‧‧表示化學藥品瓶
