Abstract
Mosquitoes can act as vectors for many disease-causing viruses and parasites through carrying these organisms from person to person. The objective of this study was to evaluate the susceptibility of Aedes aegypti larvae to some insecticides in Jeddah Governorate. Mosquito larvae were collected from all the available breeding sites in Jeddah municipalities using standard larval collection kits. The diagnostic doses (LC50 and LC90) were calculated from the mortality and concentration data. The larvicides Pirimiphos methyl, Fenitrothion, Bifenthrin and Cypermethrin were tested against the larvae of Ae. aegypti mosquito. The results showed positive correlation between the concentrations under investigation and mortality% of the treated larvae. Cypermethrin gave strong effect against Ae. aegypti larvae (LD50 0.0015 ml/L) followed by Pirimiphos methyl (LD50 0.0020 ml/L), Bifenthrin (LD50 0.039 ml/L), and at last rank Fenitrothion (0.041 ml/L). The same trend was obtained in LD90s. Ae. aegypti in Jeddah was susceptible to Bifenthrin, Cypermethrin, Pirimiphos methyl and Fenitrothion. Further studies should be run to conduct an intensive and appropriate vector control program in Jeddah Governorate.
Highlights
Mosquitoes (Diptera: Culicidae) are members of a group of about 3,500 species [1]
The same trend was obtained in LD90s
Ae. aegypti in Jeddah was susceptible to Bifenthrin, Cypermethrin, Pirimiphos methyl and Fenitrothion
Summary
Mosquitoes (Diptera: Culicidae) are members of a group of about 3,500 species [1]. Mosquitoes are found everywhere, except Antarctica and from below sea level to elevation of 3,000 m or more. The majority of mosquito species fall into three groups: anophelines, culicines and aedines [2]. Mosquitoes can be an annoying, serious problem in man's domain. Mosquito-borne diseases are responsible for a significant fraction of the global disease burden and on socioeconomic development of affected nations [3]. Larviciding largely depends on the use of synthetic chemical insecticides but it disrupted natural biological control agents and resulting in the development of resistance [4]
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