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Toxicity of Benzaldehyde and Propionic Acid against Immature and Adult Stages of Aedes aegypti (Linn.) and Culex quinquefasciatus (Say) (Diptera: Culicidae)

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Author(s): M.G. Paulraj | A.D. Reegan | S. Ignacimuthu

Journal: Journal of Entomology
ISSN 1812-5670

Volume: 8;
Issue: 6;
Start page: 539;
Date: 2011;
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Keywords: median lethal concentration (LC50) | Organic compounds | median knockdown time (KT50) | pupicidal activity | mosquito larvicidal activity

ABSTRACT
Aedes aegypti (Linn.) and Culex quinquefasciatus (Say) mosquitoes in laboratory trials to find out the possibilities of using these compounds in mosquito control programmes. Larvicidal and pupicidal activities were tested at six different concentrations and mortality was recorded after 48 h. Knockdown bioassay was performed inside a cage at single concentration. Lethal concentrations (LC50 and LC99) and knockdown time (KT50 and KT99) were calculated. Benzaldehyde treatment killed maximum larvae and pupae and its knockdown effect was also significantly high. LC50 values of benzaldehyde for Ae. aegypti and Cx. quinquefasciatus were recorded as 30.39 and 40.48 ppm, respectively. Fifty % populations of Ae. aegypti and Cx. quinquefasciatus were knocked-down in 9.44 and 12.08 min, respectively by benzaldehyde treatment. Knocked-down Ae. aegypti adults could not recover from the fumigant effect of benzaldehyde treatment and 100% adult mortality was noticed within 24 h. Hundred percent mortality of knocked-down Cx. quinquefasciatus was recorded in both benzaldehyde and propionic acid treatments. The blend of benzaldehyde and propionic acid (1:1 ratio) was not as effective as benzaldehyde treatment. Ae. aegypti larvae were more susceptible than Cx. quinquefasciatus to all the three treatments tested. But the adult stage of Ae. aegypti was less susceptible to propionic acid treatment than Cx. quinquefasciatus. The aromatic compound benzaldehyde can be used in mosquito control programme.]]>
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