Resistance of anopheline larvae to chlordane and dieldrin; field and laboratory tests on Anopheles sacharovi.

The authors present the results of field and laboratory tests carried out to determine the susceptibility to DDT, chlordane, and dieldrin of Anopheles sacharovi larvae in the small coastal plain of Astros, Peloponnesus, where chlorinated-hydrocarbon insecticides have been extensively used for house spraying and for ground and air larviciding for over ten years. It was found that the larvae had recently developed a substantial degree of resistance to chlordane and dieldrin, but no appreciable larval resistance to DDT was observed, although the latter was by far the commonest of all the larvicides used in recent years.