University of Khartoum

Toxicity of Leaves of Zizyphus spina–christi (Sider), Salvadora persica (Araak) and Lawsonia inermis (Henna) Against the Larvae of Culex quinquefasciatus Say

Toxicity of Leaves of Zizyphus spina–christi (Sider), Salvadora persica (Araak) and Lawsonia inermis (Henna) Against the Larvae of Culex quinquefasciatus Say

Show full item record

Title: Toxicity of Leaves of Zizyphus spina–christi (Sider), Salvadora persica (Araak) and Lawsonia inermis (Henna) Against the Larvae of Culex quinquefasciatus Say
Author: Taha Mansour Elhag, Hammed
Abstract: This study was carried out to evaluate the 24-hour acute toxicity of crude ethanol, and acetone extracts of the leaves of Lawsonia inermis L (Arabic: Henna), Salvadora persica L (Arabic: Araak), and Zizyphus spina- christi L (Arabic: Sider) against laboratory reared late third instar larvae of Culex quinquefasciatus Say; aiming to find cheap and environment friendly control substances. Susceptibility of the larvae to the synthetic insecticide (temephos), was also determined, for comparing, and judging experiment procedure – i.e., reference bioassay. Following World Health Organization recommendations, a bioassay of five concentrations designed to give a complete rundown mortality from 0+ to 100 % in mosquito larvae were used in addition to the control. The 24-hrs LC50, and 24-hrs LC90 were computed using probit double transformation regression analysis. the results were as follows: 1- L. inermis (Henna) leaves: (a) Acetone crude extract (LC50 =649.46 mg/l , LC90 =2481.81 mg/l). (b) Ethanol crude extract (LC50 =945.63 mg/l, LC90 =1320.48 mg/l) 2- S. persica (Araak) leaves: (a) Acetone crude extract (LC50 =477.00 mg/l, LC90 = l2323.68mg/). (b) Ethanol crude extract (LC50 =525.76 mg/l, LC90 = 2155.23mg/l). 3- Z. spina- christi (Sider) leaves: (a) Acetone crude extract (LC50 =594.43 mg/l, LC90 = 1399.44mg/l). (b) Ethanol crude extract (LC50 =893.31 mg/l, LC90 = 1663.41mg/l). 4- Temephos (LC50 =0.042 mg/l, LC90 = 0.096 mg/l). In any one plant, the acetone leaf extract was more potent than the ethanol extract. The knockdown effects of the toxicants as estimated by the slope of the regression line could be classified into three categories: (a) the first with the least knockdown effects included L. inermis (Henna) leaves acetone extract, S. persica (Araak) leaves acetone extract, and S. persica (Araak) leaves ethanol extract, (b) the second with moderate knockdown effects included Z. spina- christi (Sider) leaves acetone extract, Z. spina- christi (Sider) leaves ethanol extract, and temephos, (c) the third included only L. inermis Henna leaves ethanol extract. Behavioral responses and intoxication symptoms of tested larvae while in test solutions; were observed and recorded. All the findings of the present work were discussed on the light of scientific logic and as related to published work pertinent to the subject matter of the thesis
URI: http://khartoumspace.uofk.edu/handle/123456789/13332
Date: 2015-06-16


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account