D.D.T. and ‘Gammexane’ as Residual Insecticides against Anopheles maculatus in Malaya

Abstract

MUIRHEAD-THOMSON¹ has reported on the use of an experimental hut with a light-trap fitted into the window, as a method of assessing the efficiency of the residual insecticides D.D.T. and ‘Gammexane’ against Anopheles gambiæ in Africa. Similar experiments have recently been conducted against A. maculatus, the principal vector of malaria in Malaya. Unlike gambiæ, maculatus normally leaves houses at or before dawn to rest out of doors by day, and nearly all those captured in an untreated experimental hut were found in the light-trap in the morning.