Resistance to insecticides of Simulium soubrense and Simulium sanctipauli of the Simulium damnosum complex


Weekly Epidemiological Record 57(12): 95-96


Accession: 000970029

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In May 1980, in the Bandama River, Ivory Coast, only 1 year after temephos had first been used there as part of the Onchocerciasis Control Programme to interrupt transmission of Onchocerca volvulus by its simuliid vectors, larvae of Simulium soubrense Vajime & Dunbar and S. sanctipauli Vaijime & Dunbar in the area developed resistance to the compound. Other vectors in the area of the Onchocerciasis Control Programme remain susceptible to temephos. It was decided to use chlorphoxim instead of temephos for a limited period of time, beginning in January 1981 in the area of distribution of the resistant vectors. However, in October 1981, resistance to chlorphxim was detected at 1 locality on the Bandama River. It was therefore decided to use the biological control agent Bacillus thuringiensis (preparation H-14). A dosage of 1.6 mg/litre for 10 min was effective over 20 km downstream from the point of application. However, the effective dosage of this formulation is not compatible with the carrying capacity of the aircraft used in the Onchocerciasis Control Programme for applications in the wet season when the volume of water to be treated is very great. Attempts are being made to develop an improved formulation.