Effect ofRhazya stricta,Calotropis procera, andFrancoeuria crispaon Larvae and Eggs ofCulex pipiens
| Autor: | M. A. Al-Doghairi, E. A. Elhag |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Journal of Herbs, Spices & Medicinal Plants. 10:25-33 |
| ISSN: | 1540-3580 1049-6475 |
| DOI: | 10.1300/j044v10n02_04 |
| Popis: | Toxicity of the aqueous extracts of Rhazya stricta Decne, Calotropis procera (Ait.) Cass., and Francoeuria crispa (Forssk.) R.Br. leaves against larvae of Culex pipiens L. mosquitoes was investigated by incorporating the extracts into egg and larval rearing media. Acute LC50 were 270 and 322 ppm for R. stricta and C. procera, respectively. The chronic toxicities for R. stricta at concentrations 0.02 and 0.04 percent, reached 70 and 100 percent larval mortality, respectively, and 91.1 and 100 percent at concentrations of 0.05 and 0.075 percent, respectively, for C. procera. Both materials conferred significantly reduced larval development and thus, consequently reducing pupation and adult emergence. Only 10 and 33.3 percent of the larvae reared in media containing 0.02 percent of R. stricta water extract and 0.025 percent of C. procera completed development to the pupa stage. None of the larvae in R. stricta extract reached adulthood and only 20 percent of the larvae did in the C. procera extract.... |
| Databáze: | OpenAIRE |
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