Chloropicrin affects a broad spectrum of fungi, microbes, and insects.[8][9] It is commonly used as a stand-alone treatment or in combination / co-formulation with methyl bromide and 1,3-Dichloropropene.[9][10] Chloropicrin is used as an indicator and repellent when fumigating residences for insects with sulfuryl fluoride which is an odorless gas.[11] Chloropicrin's mode of action is unknown[12] (IRAC MoA 8B).[13] Chloropicrin may stimulate weed germination, which can be useful when quickly followed by a more effective herbicide.[14]