Perera, P.A.C.R.2014-06-032014-06-031993Paper presented at the Seminar on National Priorities of Biology, Colombo, March 1993:p...https://dl-cri.nsf.gov.lk//handle/1/3541Pests and Pest ControlPest controlPollutionEnvironmentchemical controlPollutionEnvironmentImpact of toxic chemicals on the environment