Population dynamics of anophelines in a malathion treated village in the intermediate zone of Sri Lanka.

As part of research programme on malaria transmission in Sri Lanka, a study was made of man-biting anophelines at Nikawehera, a village on the border of the intermediate and dry rainfall zones. Weekly mosquito collections by night human bait (NHB) were performed inside and outside four fixed stations from October 1992 till March 1993. Houses in the village were treated with malathion by the Anti-Malaria Campaign in October and at the end of January 1993.

High seasonal malaria transmission rates in the intermediate rainfall zone of Sri Lanka.

Malaria transmission was studied at Nikawehera, a long-established farming village, located in the intermediate rainfall zone of Sri Lanka. Observations were made over a 12-month period (October-September) that included the main rainy season which occurred during the north-east monsoon in November-January. Anolpheles culicifacies, the recognized vector of malaria in Sri Lanka, was the predominant anopheline mosquito collected by human night baiting at Nikawehera.