Insecticide Susceptibility of Aedes Aegypti ,The Vector of Dengue Fever, in Jeddah Governorate , Saudi Arabia

Khalid M. S. Al- Ghamdi¹, Z. I. Al-Fifi¹, M. S. Saleh² H. A. Al-Qhtani¹ and J. A. Mahyoub¹

¹Department of Biological Sciences, Faculty of Science, King Abdul-Aziz University, Jeddah Saudi Arabia.

²Mosquito Research Laboratory, Jeddah Saudi Arabia.

ABSTRACT: The larvicidal activity of five insecticides against Aedes aegypti , the primary vector of dengue fever in Jeddah governorate , was evaluated using the WHO standard susceptibility tests .The tested compounds were two pyrethroid insecticides Snap and Icon , the bacterial insecticide Bacilod and two insect growth regulators (IGR) Baycidal and Sumilarv. Taking LC50 values (concentration which to kill 50 % of mosquito larvae ) into consideration ,mosquito larvae of A.aegypti proved to be more susceptible to Icon (0.01 ppm) than Snap (0.048 ppm) and Bacilod (0.3 ppm) by about 4.8 and 30 folds, respectively. On the other hand, the records showed that treatments with IGR Baycidal and Sumilarv against the present mosquito larvae of A.aegypti produced various biological effects on immature stages and adults. According to IC50 values (concentration which to inhibit the emergence of 50 % of adults), Baycidal (0.0007 ppm) proved to be more effective against A.aegypti than sumilarv (0.003 ppm) by about 4.3 folds.

KEYWORDS: Susceptibility status; Mosquito larvae; Larval bioassay

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