Demeton-S-methyl is pale yellow in colour and oily and has a sulphur-like odour. It is
sparingly soluble in water but very rapidly soluble in common polar organic solvents such
as dichloromethane, 2-propanol, toluene, and n-hexane. It is a highly toxic, systemic, and
contact insecticide and acaricide and classified as Category I. It is used for the control of
insects, aphids, sawflies, and spider mites on cereals, fruits, vegetables, and ornamental
plants. On heating, demeton-S-methyl undergoes decomposition and emits very toxic
fumes, phosphorus oxides, and sulphur oxides.
