- 作者：Tankeu Nzufo Francine1 ; 3 ; Biapa Nya Prosper Cabral2 ; prbiapa@yahoo.fr" class="auth_mail" title="E-mail the corresponding author ; Pieme Constant Anatole1 ; Moukette Moukette Bruno1 ; Nanfack Pauline1 ; Ngogang Yonkeu Jeanne1
- 关键词：Aedes albopictus ; Larvicides ; Plant extracts ; Syzygium guineense ; Zanthoxylum heitzii
- 刊名：Asian Pacific Journal of Tropical Biomedicine
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：6
- 期：11
- 页码：931-936
- 全文大小：574 K
Methods
The larvicidal activity of the hydro-ethanolic extracts from these plant species was assessed at three different concentrations (50, 100 and 200 mg/L) on first-instar of Ae. albopictus larvae in comparison with untreated controls. Mortality rate was recorded daily for a period of 12 days. The values of LC50 and lethal time killing 50% of the tested individuals (LT50) were calculated using the log-probit analysis.
Results
The root extract of S. guineense exhibited the best activity with 100% mortality after 8 days of treatment at 200 mg/L, followed by the fruit extract of Z. heitzii with 83.33% mortality at the same concentration. Nonetheless, larvae were most susceptible to the fruit extract of Z. heitzii both in terms of LC50 (39.89 mg/L) and LT50 (145.68 h). A statistically significant difference between the control and the group treated at 200 mg/L was noticed in all the extracts.
Conclusions
The present study shows that the hydro-ethanolic extracts of S. guineense, Monodora myristica and Z. heitzii tested have significant larvicidal activity. These preliminary results are of great interest and some of these plant species can be proposed for the formulation of new bioinsecticides to control Ae. albopictus populations.