Pesticides

Pesticides
Introduction:
Man employs Pesticides as purposeful environmental contaminants in order to improve environmental quality for himself and his domesticated animals and plants. in agriculture, Pesticides are used to increase the cost/benefit ratio in favor of the farmer and of the ultimate consumer of food and fiber products, the citizen. it has been widely estimated that the U.S. farmer receives an average net return of about $4 for every $1 invested in Pesticides(PSAC,1965,Pimentel and Levitan,1986). in our present era of managed ecology of monocultures, of farm mechanization,and of the complex system of food harvesting, processing, distribution and storage, the use of Pesticides often represents the slender margin between crop production and crop failure, and between economic profit and economic loss.in the developing countries where food supplies are marginal,Pesticides use may represent the margin between survival and starvation.in public health, Pesticides often provide the only feasible means for the control of the invertebrate vectors of human and animal diseases.