Acephate Impurity 1

Methamidophos may cause harm to nontarget species with approved applications. Field studies indicate bird mortality can occur with methamidophos use. Methamidophos residues on food that birds may eat (e.g., leaves, insects, invertebrates) show high acute and persistent exposure. In addition, residue data on food that wild mammals may eat indicate that there would be sufficient persistent residues to cause adverse chronic effects. Methamidophos is highly toxic to bees and some beneficial insects. Freshwater and estuarine invertebrate aquatic species may be affected with normal use of methamidophos but acute risks to fish are minimal.