Abstract
Adult emergence of Simulium verecundum was reduced 75 to 100% by 0 001 to 0.1 ppm Altosid SR–10 at 25 ± 3 °C and 10 °C. No reduction in adult emergence was observed with 0.0001 ppm Altosid SR–10. 0.1 ppm of the granular R–20458 4–G reduced adult emergence 56 to 98% whereas 0.02 ppm was not effective. Exposure of black fly larvae to 0.1 ppm R–20458 4–G for 24 h gave a maximum of 50% reduction in adult emergence of those flies which had not pupated during the 24-h period.