Chlorpyrifos Common nameChlorpyrifosChemical nameO,Website:http://www.kingquenson.net, O-diethyl O-3, 5, 6-trichloro-2-pyridyl phosphorothioateCAS No2921-88-2Molecular formulaC9H11Cl3NO3PSApplicationNon-systemic insecticide with contact, stomach, and respiratory action. Control of Coleoptera, Diptera, Homoptera and Lepidoptera in soil or on foliage in over 100 crops, including pome fruit, stone ...