Influence of the mixtures composed of slow-release insecticide formulations against Aedes aegypti mosquito larvae reared in pond water.

Abstract

Vector borne diseases remain the major source of illness and death worldwide. Aedes aegypti is the primary carrier of dengue and dengue haemorrhagic fever in many developing countries in the tropical world. Because A. aegypti populations are becoming more and more resistant to conventional and non conventional insecticides, alternative strategies have to be rapidly implemented in the future for dengue vector control. The present study aimed to evaluate the larvicidal efficacy of slow-release formulations (SRFs) of bacterial insecticide Bactimos briquets blended with tow insect growth regulators (IGRs), Altosid XR – briquets and Dudim DT tablet respectively, against mosquito larvae of A. aegypti the primary vector of dengue fever in Jeddah governorate, Saudi Arabia. Semi-field trials were conducted at dengue mosquito research station, Dept. of Biological Sciences, faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia. The efficacy of the test formulations was calculated as the number of emerging adults compared to the initial number of larvae added or the inhibition of emergence (IE%). The assessment of effectiveness was made at weekly intervals until the level of efficacy decrease to ≤50% IE. The inhibition percentage of emergence of adult for each mixture weekly in addition to the calculation of the cycle of the effective centers for each mixture. Collectively, the results of the present investigation indicate that the combination of Bactimos with Altosid or Dudim maybe promising for controlling A. aegypti mosquito larvae provided that treatments persist at least during the whole dengue transmission season.