Pesticides are divided to insecticides, fungicides, herbicides, rodenticides, acaricides and nematocides according to the organisms that they affect. There are various forms of insecticides; most are repellants or insect growth regulators used in agriculture, public health, horticulture or food storage. It is evident that insecticides have been used to boost food production to a considerable extent and to control disease vectors. Insecticides are used in various forms; from hydrocarbon oils, arsenical compounds, organochlorine, organophosphorus, carbamates, dinitrophenols, organic thiocynates, sulfur, sodium fluoride, pyrethroids and rotenone, to nicotine and bioactive natural products in solid or liquid form
