Evaluation of time toxicity, residual effect, and growth-inhibiting property of Carapa guianensis and Copaifera sp. in Aedes aegypti |
| |
Authors: | Josiane S Prophiro Mario A Navarro da Silva Luiz A Kanis Bruna M da Silva Jonny E Duque-Luna and Onilda S da Silva |
| |
Abstract: | Oils of Carapa guianensis and Copaifera spp. are well-known in the Amazonian region as natural insect repellents, and studies have reported their efficiency as larvicide
against some mosquito species. However, toxicity persistence and effect on mosquito development have not yet been evaluated.
Thus, the objective of this study was to evaluate the initial time of larvicidal activity, residual effect, and the effect
of very low concentrations of these oils on Aedes aegypti. Different concentrations of the oils were used to evaluate the initial time of larval mortality and residual effect, as
well as, the development of larvae, pupae, and adults. Results demonstrated that the lethal effect started mainly between
the first 2 and 3 h of larvae exposure to oils, when using concentrations which ranged from 500 mg/L of C. guianensis and 90 mg/L of Copaifera sp. The toxic effect remained with total efficiency (100% mortality) until the sixth day for Copaifera sp. and 12th day for C. guianensis. When using sublethal dosages (ranging from 140 mg/L of C. guianensis to 26 mg/L of Copaifera sp.) mortality was observed after the larval molt. Also, imperfection of pupae and adult development and unsuccessful emergence
of adults were observed. A product of botanical origin that could break the development of immature stage of mosquitoes and
inhibit the emergence of adults should be essential in vector control. Thus, our results provide new information for a better
understanding in using C. guianensis and Copaifera sp. oils with a potential to be used as a natural insecticide. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|