Distribution and Fate of Anopheles gambiae and A. funestus in two different Types of Huts treated with DDT and BHC in Uganda

Abstract

Wood-and-fibre-board huts fitted with one-way entry and exit traps were sprayed with DDT and BHC wettable powders at dosages 3·3 and 1·5 times the dosages reported by Muirhead Thomson in Tanganyika. Mud huts similar to his design were sprayed at 1·4 times his dosage of DDT and 1·1 times his dosage of BHC. Catches of Anopheline mosquitos continued for 16 weeks.In the first-named huts kills of A. gambiae were 97 per cent. for both treatments. Kills of A. funestus were 100 per cent. and 97 per cent. for DDT and BHC respectively.In the mud huts kills of A. gambiae were 62 per cent. and 98 per cent. for DDT and BHC respectively. For A. funestus kills were 78 per cent. and 93 per cent. in the same order.The advantages claimed for the wood-and-fibre-board huts include :—(a) freedom from ants, which may remove dead mosquitos.(b) ease of catching live adult mosquitos.(c) rigid construction of exit trap.(d) lack of adventitious exits other than exit trap.