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Titre : Population Dynamics of Mosquito and the Susceptibility of Aedes aegypti Larvae (Diptera : Culicidae) to some Insecticides in Jeddah Governorate, Kingdom of Saudi Arabia (2020 –2021)

Auteur : Mohyi Eldin Abdallah Musa, Mohammed,

Université de soutenance : University of Gezira

Grade : Master of Science (MS) in Medical Entomology and Vector Control 2021

Résumé
Synthetic pesticides for mosquito control have been extensively produced and widely used, accordingly, resistance to many insecticides has been reported. The objective of this study was to evaluate biodiversity of mosquito species and the susceptibility of Aedes aegypti mosquito larvae in Jeddah, Kingdom Saudi Arabia, during (July 2020 – June 2021). Mosquito larvae were collected from all the available breeding sites in Jeddah then transferred to the insectary of Jeddah municipality. The larvae were identified morphologically using standard keys. Six formulations were used to test the susceptibility of laboratory and field strains of Ae. aegypti larvae following WHO instructions. The results showed that, Aedes larvae were far more abundant in Jeddah miscibility (74.28%) with peak abundance at September 2020 – March 2021, followed by Culex larvae (25.35%)with peak abundance at December 2020 – February 2021, whereas Anopheles larvae were less abundant (0.37%) with peak abundance at February 2021 and May 2021. The morphological features according to key for mosquito identification, proved that, most Aedes mosquitoes (58.1%) were identified as Ae. aegypti. It was also noticed that, plastic buckets are most favorable for Aedes larvae (33.72%), while water collections were most favorable for both Culex (21.07%) and Anopheles (29.3%). The results also showed that, pirimiphos gave higher effect against laboratory strains of Ae. aegypti larvae (LD50 2.1 mg/L) than fenitrothion (LD50 179.3 mg/L). Cypermethrin gave strong effect against laboratory strains of Ae. Aegypti larvae (LD50 1.4 mg/L) than Bifenthrin (LD50 34 mg/L). Diflubenzuron at (7.8-125 mg/L) and S-methoprene at (51.3-820 mg/L) caused 11.2% and 15.4% larval mortality, respectively. The same concentrations of diflubenzuron and S-methoprene produced 27.8% inhibition of adult emergence. It was noticed that, the lab strains of Ae. aegypti were more susceptible than field strains. Further studies concerning biology and ecology are needed to design IVM strategies for surveying, monitoring, testing and applying of any measure to control mosquito’s in the study area.

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