In ecological studies in the Westem and Far East countries, spiders were found as important predators of insects in agroecosystems. In faunistic works performed in fields such as all alfa, wheat, corn, rice and cotton, The lycosid and linyphiid spiders were found as the most encounlered predalors among the arthropods. Prey of these predators of agricultural ecosystems are mainly soft bodied insects such as Collemboia, Heteroptera, Homoptera and Diptera. Recently, intensive invesligations have been done on preypredator relation between spiders and insects, and on role of spiders in conservation of the ecological balance. In addition, some other studies have showed that the pesticides applicd in agricultural fields caused important casualties in spider populations.