formulations: 20% SL, 90% SP, 98% Tech Mode of action: Methomyl is a systemic Insecticide and acaricide with contact and stomach action. Uses: Methomyl is used to control a wide range of insects and spider mites. Also used for control of flies in Animal and Poultry houses and dairies. Phytotoxicity: Methomyl is non-phytotoxic when used as recommended, except to some varieties of Apple.