Until the beginning of the twentieth century, farmers relied exclusively on cultural practices such as crop rotation manipulations in sowing dates, etc. to healthy crop variety, manage the insect pests. Use of pesticides although began in the 1870s with the development of arsenical and copper dichlorodiphenyltrichloro- based insecticides. Discovery of acetic acid(DDT) having pesticidal properties during the World War Il revolutionized the pest control. DDT was effective at low concentration against almost all insect spe- cies, less expensive and supposed to be harmless to the human beings, animals and plants(Davies et al. 2007). Therefore, farmers were amazed with its effectiveness and started to use it increasingly particularly during the green revolution era. As a result of increasing demand, the pesticide industry rapidly expanded its research to development of synthetic organic insecticides and other chemicals controlling the pests. The negative externalities of chemical pesticides, however, started emerging soon after the introduction of DDT. Producers then tumed to the more recently developed, and much more toxic, organophos insecticides, which resulted in the phates and pyretheroid development of resistant strains. Most of the pesticides were originally based on the toxic heavy metals such as arsenic, mercury, lead and copper(Davies et al. 2007)