Chemistry Name:O-(4-bromo-2-chlorophenyl)- O - ethyl- S - propyl phos-phorothioate. Function: insecticide and acaricede Mode of function: touching poison, stomach killing and penetrating. Dosage: 255-1200g/ha. Physical character: light – brown liquid Toxicity: LD50358mg/kg Quality index: > or = 90% Packing: plastic – lined drum, 200kg/drum