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

Research Article

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

M.G. Paulraj, A.D. Reegan and S. Ignacimuthu

The larvicidal, pupicidal and knockdown effects of benzaldehyde, propionic acid and their blend (1:1 ratio) were evaluated against 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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M.G. Paulraj, A.D. Reegan and S. Ignacimuthu, 2011. Toxicity of Benzaldehyde and Propionic Acid against Immature and Adult Stages of Aedes aegypti (Linn.) and Culex quinquefasciatus (Say) (Diptera: Culicidae). Journal of Entomology, 8: 539-547.

DOI: 10.3923/je.2011.539.547

URL: https://scialert.net/abstract/?doi=je.2011.539.547

Journal of Entomology

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Authors

M.G. Paulraj

A.D. Reegan

S. Ignacimuthu

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Research Article

**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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