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Journal of Arthropod-Borne Diseases، جلد ۱۱، شماره ۲، صفحات ۲۶۰-۰
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عنوان انگلیسی Larvicidal Activities of Indigenous Bacillus thuringiensis Isolates and Nematode Symbiotic Bacterial Toxins against the Mosquito Vector, Culex pipiens (Diptera: Culicidae)
چکیده انگلیسی مقاله Background: The incidence of mosquito-borne diseases and the resistance of mosquitoes to conventional pesticides have recently caused a panic to the authorities in the endemic countries. This study was conducted to identify native larvicidal biopesticides against Culex pipiens for utilization in the battle against mosquito-borne diseases. Methods: Larvicidal activities of new indigenous Bacillus thuringiensis isolates and crude toxin complexes (TCs) of two nematode bacterial-symbionts, Photorhabdus luminescens akhurstii (HRM1) and Ph. luminescens akhurstii (HS1) that tested against Cx. pipiens . B. thuringiensis isolates were recovered from different environmental samples in Saudi Arabia, and the entomopathogenic nematodes, Heterorhabditis indica (HRM1) and He. sp (HS1) were iso­lated from Egypt. Larvicidal activities (LC 50 and LC 95 ) of the potentially active B. thuringiensis strains or TCs were then evaluated at 24 and 48h post-treatment. Results: Three B. thuringiensis isolates were almost as active as the reference B. thuringiensis israelensis (Bti-H14), and seven isolates were 1.6–5.4 times more toxic than Bti-H14. On the other hand, the TCs of the bacterial sym­bionts, HRM1 and HS1, showed promising larvicidal activities. HS1 showed LC 50 of 2.54 folds that of HRM1 at 24h post-treatment. Moreover, histopathological examinations of the HS1-treated larvae showed deformations in midgut epithelial cells at 24h post-treatment. Conclusion: Synergistic activity and molecular characterization of these potentially active biocontrol agents are currently being investigated. These results may lead to the identification of eco-friend mosquito larvicidal product(s) that could contribute to the battle against mosquito-borne diseases.
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نویسندگان مقاله اشرف m احمد | ashraf m ahmed
department of plant protection, college of food and agricultural sciences, king saud university, riyadh, saudi arabia


hamdy i حسین | hamdy i hussein
department of clinical laboratory sciences, college of applied medical sciences, king saud university, riyadh, saudi arabia


طلعت a el kersh | talat a el kersh
department of clinical laboratory sciences, college of applied medical sciences, king saud university, riyadh, saudi arabia


yazeed a al شیخ | yazeed a al sheikh
department of zoology, college of science, king saud university, riyadh, saudi arabia


طهانی h ayaad | tahany h ayaad
parasitology and animal diseases department, veterinary division, national research centre, dokki, giza, egypt


حنان a el sadawy | hanan a el sadawy
bioproducts research chair, department of zoology, college of science, king saud university, saudi arabia department of agricultural production, college of agriculture and veterinary medicine, thamar university, dhamar, yemen


fahd a al mekhlafi | fahd a al mekhlafi
department of clinical laboratory sciences, college of applied medical sciences, king saud university, riyadh, saudi arabia


محمد s ابراهیم | mohamed s ibrahim
department of zoology, college of science, king saud university, riyadh, saudi arabia


jameel al تمیمی | jameel al tamimi
bioproducts research chair, department of zoology, college of science, king saud university, saudi arabia


fahd a نصر | fahd a nasr


نشانی اینترنتی http://jad.tums.ac.ir/index.php/jad/article/view/580
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/77/article-77-429944.pdf
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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