Abstract: The current invention involves compositions and methods for killing various soft-bodied animals of interest with a low pH adjusted pesticide. The method involves contacting the soft-bodied animal of interest with the low pH adjusted pesticide, wherein the pesticide is a propionic acid composition, a citric acid composition, an Acidic Calcium Sulfate composition, or combination thereof. The pesticide has a lethal effect on Coqui frogs, but is less phytotoxic than higher concentration pesticides. The method includes spraying any of the pH adjusted pesticides thoroughly an area inhabited by the soft-bodied animals of interest, including any typical hiding places. On a large scale, the method contemplates filling various types of industrial spraying equipment with the pesticide and saturating entire pest inhabited areas.