The effect of co2, sweat, chemical vapours and air on simulium: implications for control.
2008
Opoku, A.A., CSIR-Water Research Institute, P. O. Box M32, Accra.
Studies on the response of the blackfly Simulium ornatum s.l (Diptera Simuliidae) to carbon dioxide (C02. acetone, l-octen-3-01 and air was conducted in the laboratory using a Y-tube olfactometer. The blackflies were found to exhibit a high degree of activity in the olfactometer and responded to the various odours. The results showed that CO2 and l-octen-3-01 were attractive to the flies at low concentrations (1% CO2 and 2.5% 1-octen-3-01) and repellent at high concentrations ( 2% CO2 and 4% l-octen-3-01). Humidified air was found to be an attractant, and dry air a repellent. Acetone at low concentrations (0.2%) did not appear to have any effect, while at higher concentrations ( 1%) it repelled. The results indicate that the use of attractive odours could be beneficial in reducing vector biting of hosts if used in areas where the host is present.
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