Lorsban 75WG is listed as chlorpyrifos: 0,0-diethyl(3,5,6-trichloro-2-pyridyl) What does 'chlorpyrifos' represent?

• A. The chemical name
• B. A brand name
• C. A regulatory code
• D. A formulation type

Answer: (A)

Chlorpyrifos is the active ingredient’s chemical (or common) name. In a pesticide label like Lorsban 75WG, the brand name is Lorsban, the formulation type is indicated by 75WG (a wettable granule with about 75% active ingredient), and the part after the colon gives the chemical name of the active ingredient. The long descriptor within that part is the chemical structure of chlorpyrifos. So chlorpyrifos represents the active ingredient itself, not the brand, a regulatory code, or the formulation type.