An insecticidal composition which comprises an ester compound given by
formula (1): ##STR00001## [wherein R represents a methyl or
methoxymethyl group] and 2,4,6-triisopropyl-1,3,5-trioxane as active
ingredients, wherein the weight ratio of the ester compound to
2,4,6-triisopropyl-1,3,5-trioxane is 1:4000 to 1:4, is useful for
controlling insects, especially insects which are harmful to fabric.