Pesticide residue refers to the pesticides that may remain on or in food after they are applied to food crops. Many of these chemical residues, especially derivatives of chlorinated pesticides or organophosphate pesticides exhibit bio-accumulation which could build up to harmful levels in the body as well as in the environment.Persistent chemicals can be magnified through the food chain and have been detected in products ranging from meat, and fish, to rice, cereals, nuts, and various fruits and vegetables.