EFFECT OF IVERMECTIN ON THE OVIPOSITION SITE SELECTION, EGG HATCHABILITY AND ATTRACTABILITY OFCULEX QUINQUEFASCIATUS SAY 1823 (DIPTERA: CULICIDAE)

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dc.contributor.authorAIYEDUN, EMMANUE LAdonmosi
dc.date.accessioned2014-08-12T08:35:42Z
dc.date.available2014-08-12T08:35:42Z
dc.date.issued2014-06
dc.descriptionA THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER DEGREE IN BIOLOGY. DEPARTMENT OF BIOLOGICAL SCIENCES, FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY, ZARIA NIGERIA JUNE, 2014en_US
dc.description.abstractThis study was conducted to evaluate the effects of ivermectin on oviposition site selection, egg hatchability, attractabilityand larval mortalityofCulex quinquefasciatus Say 1823 (Diptera:Culicidae).Oviposition site selection was evaluated by placing 10 gravid female Cx. quinquefasciatus in a wooden cage provided with graded dilutions of ivermectin solutions using distilled water in plastic cups as control. Oviposition deterrent test and effective repellency (ER) were used to evaluate the oviposition deterrent activity of ivermectin.Groups of 50 freshly laid eggs were exposed to graded dilutions of ivermectin for 18 hours, and the hatchability (%) of these eggs was calculated. Groups of 50 freshly laid eggs were exposed to graded dilutions of ivermectin solution for 5, 15, 30 and 60 minutes. Graded dilutions of ivermectin were mixed with 10% sucrose solution in plastic cups with a cotton wick and placed in cages to test for its efficiency as attractive toxic sugar bait. High concentrations of ivermectin was observed to deterCx. quinquefasciatusfemales while lower concentrations showed ―attract and kill‖ effect on them: oviposition activity index valuesfor the test species were 0.6, 0.3, 0, 0, -1, -1 and -1 for ivermectin at concentrations of1, 5, 10, 20, 40, 80 and 100ppm respectively. 93.3% of the femaleCx. quinquefasciatus died (out of which 67.9% were still gravid and 32.1% oviposited) in ivermectin treated cups, while 6.7% survived in the control. The 50% egg hatching inhibition concentration (IC50) was noted at 26.81ppm. Time of exposure and ivermectin concentration influenced egg hatchability.Ivermectin was highly toxic to adult Cx. quinquefasciatus as an attractive sugar bait.Ivermectin showed LC50of 3.78ppb and LC95of 7.47ppb for 1st instar larvae and LC50of 11.49ppb and LC95 of 35.20ppb against 3rd instar larvae ofCx. quinquefasciatus as determined by probit analysis.It is concluded that ivermectin serves as a potent insecticide against Cx. quinquefasciatus, thereforeholding promise to suppress vector population therebyreducing its biting nuisance and nocturne discomfort while adversely influencing the transmission of its associated disease pathogens.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5218
dc.language.isoenen_US
dc.subjectEFFECT,en_US
dc.subjectIVERMECTIN,en_US
dc.subjectOVIPOSITION,en_US
dc.subjectSITE,en_US
dc.subjectSELECTION,en_US
dc.subjectEGG,en_US
dc.subjectHATCHABILITY,en_US
dc.subjectATTRACTABILITY,en_US
dc.subjectCULEX,en_US
dc.subjectQUINQUEFASCIATUS,en_US
dc.subject1823en_US
dc.subject(DIPTERA: CULICIDAE)en_US
dc.titleEFFECT OF IVERMECTIN ON THE OVIPOSITION SITE SELECTION, EGG HATCHABILITY AND ATTRACTABILITY OFCULEX QUINQUEFASCIATUS SAY 1823 (DIPTERA: CULICIDAE)en_US
dc.typeThesisen_US
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