Screening and evaluation of different algal extracts and prospects for controlling the disease vector mosquito Culex pipiens L.

Saudi Journal of Biological Sciences

Neamat H. El Tablawy¹  Mohamed T. El-Saadony²  Shaimaa M. Farag³  Samy Sayed⁴  Lamya Ahmed Alkeridis⁵  Doaa R. Abdel Haleem⁶  Ahmed M. Saad⁷ 

[1] Corresponding authors.;Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt;Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, 44511 Zagazig, Egypt;Department of Biology, Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia;Department of Botany, Faculty of Science, Ain Shams University, 11566 Cairo, Egypt;Department of Entomology, Faculty of Science, Ain Shams University, 11566 Cairo, Egypt;Department of Science and Technology, University College-Ranyah, Taif University, B.O. Box 11099, Taif 21944, Saudi Arabia;

关键词: Culex pipiens;    Larvicids;    Galaxaura elongate;    Jania rubens;    Codium tomentosum;    Ulva intestinalis;   

DOI  :  

来源: DOAJ

【 摘 要 】

Continual application of synthetic insecticides in controlling mosquito larvae has resulted in several problems as build-up of mosquito resistance beside to negative impacts on human health and environment. Discovering new and affordable bio-insecticidal agents with high efficiency, cost effective and target specific become a crucial need. The current study assessed the larvicidal activity of eight methanolic algal extracts belong to three different algal divisions against the 3rd larval instar of Culex pipiens L. (Diptera: Culicidae). Comparative studies showed that four species of red and green algal extracts exhibited good larvicidal activity. Galaxaura elongata and Jania rubens (Rhodophyta), Codium tomentosum and Ulva intestinales (Chlorophyta) showed higher larvicidal potencies than Padina boryana, Dictyota dichotoma, and Sargassum dentifolium (Phaeophyta) and Gelidium latifolium (Rhodophyta). The maximum level of toxicity was achieved by exposure to G. elongata extract with LC50 (31.13 ppm), followed by C. tomentosum (69.85 ppm) then J. rubens (84.82 ppm) and U. intestinalis (97.54 ppm), while the lowest toxicity exhibited by G. latifolium (297.38 ppm) at 72 h post- treatment. The application of LC50 values of G. elongate, J. rubens, C. tomentosum, and U. intestinalis extracts affected the activities of antioxidant enzymes viz. superoxide dismutase, catalase and glutathione peroxidase as oxidative stress markers. An increase of antioxidant enzymes activities was recorded. Therefore, a significant elimination of free radicals, causing toxic effects. Overall, this study casts light on the insecticidal activity of some algal extracts, suggesting the possibility of application of these bio- agents as novel and cost- effective larvicides.

【 授权许可】

Unknown