Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae)
El-Sheikh, T., Hassan, M., Moselhy, W., Amer, M., Shehata, A. (2011). Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae). EKB Journal Management System, 4(1), 33-48. doi: 10.21608/eajbsa.2011.15170
Tarek M.Y. El-Sheikh; Mostafa I. Hassan; Walaa A. Moselhy; Mouneer S. Amer; Ahmed Z. Shehata. "Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae)". EKB Journal Management System, 4, 1, 2011, 33-48. doi: 10.21608/eajbsa.2011.15170
El-Sheikh, T., Hassan, M., Moselhy, W., Amer, M., Shehata, A. (2011). 'Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae)', EKB Journal Management System, 4(1), pp. 33-48. doi: 10.21608/eajbsa.2011.15170
El-Sheikh, T., Hassan, M., Moselhy, W., Amer, M., Shehata, A. Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae). EKB Journal Management System, 2011; 4(1): 33-48. doi: 10.21608/eajbsa.2011.15170

Evaluation of the biological activity of some Cupressus semprevirens (Cupressaceae) extracts against the mosquito vector Culex pipiens L. (Diptera: Culicidae)

Egyptian Academic Journal of Biological Sciences. A, Entomology
Article 4, Volume 4, Issue 1, June 2011, Page 33-48  XML PDF (276.59 K)
Document Type: Original Article
DOI: 10.21608/eajbsa.2011.15170
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Authors
Tarek M.Y. El-Sheikh1; Mostafa I. Hassan1; Walaa A. Moselhy2; Mouneer S. Amer3; Ahmed Z. Shehata3
1Department of Biology, faculty of Science, Jazan University, Jazan, Saudi Arabia.
2Department of Zoology, Faculty of Science(girls), Al-Azhar University, Nasr City, Cairo, Egypt
3Department of Zoology, Faculty of Science (boys), Al-Azhar University, Nasr City, Cairo, Egypt
Abstract
Ethanolic, acetone and petroleum ether extracts of leaves from the Egyptian plant Cupressus sempervirens (Cupressaceae) were tested against 3rd instar larvae of the mosquito Culex pipiens L. The obtained results indicated that petroleum ether extracts were more efficient than ethanolic and acetone extracts. The toxicity, based on Lc50 values, are arranged in a descending order as follows: ethanolic (Lc50 263.6ppm) > acetone extract (Lc50 104.3ppm) > petroleum ether extracts (Lc50  37.8 ppm). As shown by the present results, a remarkable reduction in both the pupation percent and adult emergence was obtained. Moreover, all plant extracts exerted a delayed toxic effect on the pupae and adults after treatment of larvae. Also, various degrees of morphogenic abnormalities were observed in the immature and adult stages. Thus, these results may provide an opportunity to develop alternatives to costly organic pesticides and environmentally hazardous chemicals with some available cheap plants which are uaually environmentally safe to different living organisms.
Keywords
ethanolic extract; Acetone extract; Petroleum ether extract; toxicity; Cupressus sempervirens; Culex pipiens; Growth; mortality; pupation; emergence; Malformation
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