LABORATORY STUDIES OF THE EFFECTIVENESS OF BACILLUS THURINGIENSIS SEROTYPE H-14 AGAINST CULEX PIPIENS LARVAE

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dc.contributor.authorSHEHU, HAJARA
dc.date.accessioned2014-02-10T11:50:13Z
dc.date.available2014-02-10T11:50:13Z
dc.date.issued1986-10
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF:en_US
dc.description.abstractThe effectiveness of Bacillus thuringiensis H-14 as a biological control agent was tested in the laboratory against culex pipiens larvae by bic>assay methods. The second, third and fourth instar larvae were exposed to different bacterial concentrations. The percentage mortality of mosquito larvae increased with increase in concentration, exposure time and water volume but decreased with the increase in larval age from second to fourth instars. The LC50 values after 6 and 24 hours in 150 ml of bacterial suspension were 0.020 mg/1 and 0.0036 mg/3 for second instars; 0.04 mg/1 and 0.009 mg/1 for third instars; 0.063 mg/1 and 0.013 mg/1 for fourth instar larvae. In 30 ml of bacterial suspensions, these values were 0.038 mg/1 and 0.008 mg/1; 0.05 mg/1 and 0.015 ng/1; 0.158 mg/1 and 0.017 rag/I for second, third and fourth instar larvae after 6 and 24 hours exposures respectively. The LC90 values after 6 - 24 hours in 150 ml of bacterial suspensions for second, third and fourth larval stages were 0.'i58 mg/1 - 0.022 mg/1, 0.199 mg/1 •• 0.050 mg/1 and 0.251 mg/1 - 0.071 mg/1 while in 30 ml bacterial suspensions, these values were 0.211 mg/1 - 0.093 mg/1, 0.251 mg/1 - 0.079 mg/1 and 0.791 mg/1 - 0.081 mg/1 respectively. vi Statistical tests to determine differences in mortality due to exposure time, beakers and larval instars were all found to be significant (P>0.05).en_US
dc.identifier.urihttp://hdl.handle.net/123456789/949
dc.language.isoenen_US
dc.subjectLABORATORYen_US
dc.subjectSTUDIESen_US
dc.subjectEFFECTIVENESSen_US
dc.subjectBACILLUSen_US
dc.subjectTHURINGIENSISen_US
dc.subjectSEROTYPEen_US
dc.subjectH-14 AGAINSTen_US
dc.subjectCULEXen_US
dc.subjectPIPIENSen_US
dc.subjectLARVAEen_US
dc.titleLABORATORY STUDIES OF THE EFFECTIVENESS OF BACILLUS THURINGIENSIS SEROTYPE H-14 AGAINST CULEX PIPIENS LARVAEen_US
dc.typeThesisen_US
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