Fipronil is a phenylpyrazole insecticide. It has mainly gastric poisoning effects on pests, with both contact killing and certain systemic effects. It has high insecticidal activity against aphids, leafhoppers, planthoppers, lepidopteran larvae, flies, coleoptera and other pests. It is not harmful to crops, but it is toxic to fish, shrimp, honey, and silkworms.