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Biocidal Effect of Gumbail Tree (Cordia africana L.) Extracts on Anopheles and Culex Larvae (Diptera : Culicidae)

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dc.contributor.author AbdEldafie, Elagbash Ibrahim Elamin
dc.date.accessioned 2019-04-01T06:37:31Z
dc.date.available 2019-04-01T06:37:31Z
dc.date.issued 2017-08-24
dc.identifier.uri http://repo.uofg.edu.sd/handle/123456789/3592
dc.description A Thesis Submitted to the University of Gezira in Fulfillment of the Requirements for the Award of the Degree of Doctor of Philosophy in Biosciences and Biotechnology (Applied Entomology) Center of Biosciences and Biotechnology Faculty of Engineering and Technology,August, 2017 en_US
dc.description.abstract Mosquitoes transmit diseases to more than 700 million persons annually in Africa, South America, Central America, Mexico and Asia with millions of resulting deaths.Natural products were used to control different diseases. The present study was aiming to investigate the biocidal effect of the aqueous and ethanolic extracts of Gumbail tree bark, leaves and fruits on the larvae of Anopheles and Culex mosquitoes. The study continued for three years (2014-2016). The plant materials were collected from Zalengi and Kass, some phytochemical tests were done in the labrotary of chemical analysis, University of Gezira. While mosquito larvae were collected from Alkariba area, Wad Medani Great locality, Gezira State. They were reared according to the specifications described by the WHO 1980. A series of Gumbail tree extracts concentrations were prepared and applied against the tested organisms. Percentages of mortality were recorded after 24 hours and each test was replicated three times. The probit analysis was carried out to determine the proper concentrations for producing deaths. Results of this study have shown the presence of alkaloids, flavonoids, saponins and tannins in Gumbail tree by using of phytochemical screening tests. In the TLC test four solvents were used as follow, petroleum ether, hexane, ethanol and chloroform and the results obtained with petroleum ether separated nine spots, hexane separated six spots and ethanol and chloroform each one separated five spots. All Gumbail tree extracts caused severe death on the tested larvae with varied degrees. The fruits were the highly effective parts the aqueous extract gave (45.65 mg/l and 463.06 mg/l were the values of LC50 and LC95 respectively, for Anopheles larvae and 43.09 mg/l and 328.19 mg/l were the values of LC50 and LC95 respectively, for Culex larvae), while the bark was the lower effective partsthe aqueous extracts gave (96.76 mg/l and 1435.96 mg/l were the values of LC50 and LC95 respectively, for Anopheles larvae and 87.58 mg/l and 1325.26 mg/l were the values of LC50 and LC95 respectively, for Culex larvae), on the other hand the fruits ethanolic extract (40.84 mg/l and 304 mg/l were the values of LC50 and LC95 respectively, for Anopheles larvae and 35.67 mg/l and 237.13 mg/l were the values of LC50 and LC95 respectively, for Culex larvae) were more effective than of the aqueous extract (45.65 mg/l and 463.06 mg/l were the values of LC50 and LC95 respectively, for Anopheles larvae and 43.09 mg/l and 328.19 mg/l were the values of LC50 and LC95 respectively, for Culex larvae). The lethal concentrations (LC50 and LC95) of Gumbail tree extracts for the Anopheles larvae were very high when compared to that of Culex larvae. There are some degrees of malformation observed among the larvae. The recommendation of this study is to continue investigation on natural products to determine and add any products potential as mosquito larvaicides and the study recommends more scientific research on the same topic particularly the active ingredients of Gumbail tree. en_US
dc.description.sponsorship Elnour Elamin Abd Elrahman Supervisor Mutaman Ali A. Kehail Co-Supervisor en_US
dc.language.iso en en_US
dc.publisher University of Gezira en_US
dc.subject world of insects en_US
dc.subject Mosquito en_US
dc.subject Natural products en_US
dc.subject Gumbail tree en_US
dc.subject Mosquito control en_US
dc.title Biocidal Effect of Gumbail Tree (Cordia africana L.) Extracts on Anopheles and Culex Larvae (Diptera : Culicidae) en_US
dc.type Thesis en_US


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