Repellent Activity of Origanum syriacum (Lamiaceae), Pergularia tomentosa (Apocynaceae), and Senna italica (Fabaceae) Leaves Extracts against Culex pipiens L. (Diptera: Culicidae)

Shahat, Mohamed A.M.; El-sheikh, Tarek M.Y.; Ammad, Kotb M.; Hasaballah, Ahmed; Shehata, Ahmed Z.I.

doi:10.21608/eajbse.2020.128497

Repellent Activity of Origanum syriacum (Lamiaceae), Pergularia tomentosa (Apocynaceae), and Senna italica (Fabaceae) Leaves Extracts against Culex pipiens L. (Diptera: Culicidae)

Document Type : Original Article

Authors

¹ Department of Zoology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11651, Egypt.

² Department of Zoology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11651, Egypt

10.21608/eajbse.2020.128497

Abstract

The present study aimed at investigating the repellent activity of methanol, ethyl acetate, chlorobenzene and hexane extracts from leaves of Origanum syriacum, Pergularia tomentosa and Senna italicaagainst Culex pipiens starved females. Three doses were used (0.83, 1.67 and 3.33 mg/cm²) to test the repellent activity of selected extracts. The obtained results revealed that all tested extracts evoked a variable degree of repellent activity against C. pipiens starved females depending on the solvent used in the extraction and the dose. Potent repellent activity (91.53%) was recorded by hexane extract from leaves of O. syriacum at the dose of 3.33 mg/cm², while, the lowest repellent activity (22.07%) was recorded by methanol extract from leaves of O. syriacum at the dose of 0.83 mg/cm², respectively. According to RD₅₀and RD₉₀ values, hexane extraction from leaves of all tested plants was more effective against C. pipiens starved females than chlorobenzene, ethyl acetate and methanol extractions. Also, methanol, ethyl acetate, chlorobenzene and hexane extracts from leaves of O. syriacum were more effective against C. pipiens starved females than those of S. italica and P. tomentosa.

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