文章基本信息

标题：Toxicity of Spathodea campanulata P Beauvois (Scrophulariales: Bignoniaceae) aqueous extracts against immature stages of Anopheles albimanus (Diptera: Culicidae) under laboratory conditions
本地全文：下载
作者：Jose Luis Torres-Estrada ; Julio Cesar Velazquez Gonzalez ; Silvany M Rios Delgado 等
期刊名称：Research and Reports in Tropical Medicine
印刷版ISSN：1179-7282
电子版ISSN：1179-7282
出版年度：2010
卷号：1
页码：83-87
DOI：10.2147/RRTM.S14130
出版社：Dove Medical Press Ltd
摘要：Purpose: To determine the effects of African tulip Spathodea campanulata aqueous extracts on every immature stage of Anopheles albimanus under laboratory conditions. Methods: The extract was obtained making an incision on the apical part of prefloral bulbs, and two sets of dilutions with distilled water were prepared. The first set was used at 50%, 20%, 10%, 5%, and 2.5% concentrations in bioassays to test its effect on egg-hatching inhibition. The second set was used at 10%, 5%, 1%, 0.1%, and 0.01% to test toxicity on larvae and pupae. Also, residual efficacy and lethal time (LT) were estimated. Results: The highest inhibition (87.5%) recorded for egg hatching was at a 50% concentration. Third and fourth instar larvae and pupae were the most susceptible to 10% and 5% of S. campanulata aqueous extracts, with 98.3%–100% mortality. The residual activity with 10% concentration persisted 7 days, with 100% mortality, and LT for 99% mortality (LT₉₉) was 2.28 hours on third instar larvae, 1.7 hours on fourth instar larvae, and 2.25 hours on pupae. Conclusion: S. campanulata extracts are promising as biolarvicides. Further toxicological and chromatographic studies are encouraged and needed.
关键词：African tulip; botanical insecticides; malaria; mosquitoes