University of Khartoum

Assessment Of The Potentialities Of Three Speices Of Zalingei Natural Flora As Pest Control Agents

Assessment Of The Potentialities Of Three Speices Of Zalingei Natural Flora As Pest Control Agents

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Title: Assessment Of The Potentialities Of Three Speices Of Zalingei Natural Flora As Pest Control Agents
Author: Osman, Fatin Abdalla
Abstract: The study included two parts, laboratory and field study to assess the potentialities of crude extracts of the three plants species as control agents. The laboratory works: Alcoholic crude extracts were prepared from Khaya senegalensis (Mahogany), Boscia senegalensis (Mokhait), and Acacia nubica (La’ot) barks from which different concentrations were prepared. Also preliminary chemical analysis was done to know the most important potential natural compounds known to act as insecticides in the extracts of these plants. The results of the preliminary analysis have shown that the bark extracts of the three plants contain natural compounds which include secondary metabolic products to protect plants against various pests. These metabolites include alkaloides, saponins, tannins, cumarines, flavonoids, triterpenes and streoles. The compounds act together or individually as growth inhibitors or toxicant or antifeedant or repellents. The Field work: The interveiws carried out in June 2006 in Zalingei - Darfur - Sudan's west. The results of the social survey showed that farmers in that region use several native plants for the solution of pest control problem, such as Khaya senegalensis (Mahogany), Boscia senegalensis (Mokhait), and Acacia nubica ( La’ot) which are the focus of this study. These plants are naturally distributed in the area and are available all year round and handy to xxi the farmers and their collection and application is easy. In addition to that, they are cheap and safe to man, animals, and the environment. This is one of the reasons that encouraged farmers to use these plants. The farmer’s claim that the part mostly used was the barks.A field experiment was conducted for two successive seasons 2007 / 2008 and 2008/2009 at the experimental farm of the Faculty of Agriculture, University of Khartoum - Shambat to study the effect of the organic extracts of the three plants on okra insect pests (white fly and African bollworm). Three different concentrations 5%, 2.5%, 1.25% were used compared with the control and treated control to study the effect of bark extracts on the populations of the insect pests, Whitefly and African bollworm and the beneficial insects. The results showed that the different concentrations of the plants extracts have significant effect in reducing the population of the white fly and American bollworm insects; also there are no significant differences between the different concentrations. However, the concentration 5% gave the best results in some treatments. The results of the study showed that there was no significant differences between the extracts of (Khaya senegalensis (Mahogany),Boscia senegalensis (Mokhait), and Acacia nubica ( La’ot)), but in some treatments the results showed that the extract of Acacia nubica ( La’ot) have given the best results in reducing the population of the insect pests
Description: 183 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/17426
Date: 2015-12-03


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