[Insecticide tests for resistance on adults of Anopheles sinensis and Culex tritaeniorhynchus in Korea].

During the summer season(July-August) in 1967, the insecticide tests for resistance on adult A. sinensis and C. tritaeniorhynchus were carried out in Gobu-Myun Jeongup-Gun, Chollapuk-Do, where many Japanese encephalitis cases occur every year. 1)The mortality by 4.0% DDT in A. sinensis was 88.9% and by 4.0% dieldrin was 84.4%. Therefore the LC-50 of DDT for A. sinensis was 1.75%, while LC-50 of dieldrin was 1.1%. 2)The mortality by 4.0% DDT in C. tritaeniorhynchus was 36.7%, and by 4.0% dieldrin was 6.0% 3)The result indicates that A. sinensis in Korea is susceptible to DDT and resistant to dieldrin. 4)C. tritaeniorhynchus is highly resistant to both DDT and dieldrin.