Chlorpyrifos-methyl is a non-systemic organophosphorus insecticide and acaricide applied to fruits, vegetables, cereals, and stored grain against biting and chewing pests. The US EPA classifies it as slightly toxic. Like its close relative chlorpyrifos, it faces tightening restrictions in several markets over health concerns, and its future in some regions is uncertain. Grain protectants containing it must respect label rates, application timing, and maximum residue limits for stored commodities, with monitoring programs verifying that treated grain entering food and feed channels complies with legal residue levels.