Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos

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dc.contributor.advisorPringle, K. L.
dc.contributor.authorDe Wet, Owen
dc.contributor.otherStellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology.en_ZA
dc.date.accessioned2012-08-27T14:03:51Z
dc.date.available2012-08-27T14:03:51Z
dc.date.issued2004-03
dc.descriptionThesis (MScAgric)--Stellenbosch University, 2004.en_ZA
dc.description.abstractENGLISH ABSTRACT: Colonies of Planococcus ficus (Signoret) were reared from three different areas, Hex River Valley, Robertson and Stellenbosch. An insectary colony and a table grape colony from Nietvoorbij experimental farm were also included in the study. A range of concentrations of chlorpyrifos was applied topically to individuals from the different colonies. The Stellenbosch population had the lowest LDso, although it was not significantly different from that of the insectary and Robertson colonies. The Hex River Valley and table grape colonies had a significantly higher LDso than the Robertson, Stellenbosch and insectary colonies, although the relative tolerance was 1.5, which would probably not result in significant control failure in the field. However, this does indicate that there is potential for the development of resistance to chlorpyrifos in the vine mealybug in South Africa.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: Kolonies van Planococcus ficus (Signoret), is versamel en geteel uit drie verskillende areas, Hex.riviervallei, Robertson en Stellenbosch. 'n Bestaande insektarium kolonie van die Lanbou Navorsings Raad en 'n tafeldruif kolonie vanaf Nietvoorbij proefplaas is ook ingesluit in die studie. 'n Reeks konsentrasies van chlorpyrifos is topikaal aangewend aan individue van die verskillende kolonies. Die Stellenbosch populasie het die laagste LDso getoon alhoewel dit nie betekenisvol verskil het van die LDso van die insektarium - en Robertson kolonies nie. Die Hexriviervallei en tafeldruif kolonies se LDso was betekenisvol hoër as die Robertson, Stellenbosch and insektarium kolonies. Alhoewel die relatiewe weerstand 1.5 was, sal dit waarskynlik nie tot 'n aansienlike beheermislukking in die veld lei nie. Nogtans dui dit op die potensiaal vir moontlike ontwikkeling van weerstand teen chlorpyrifos in die wingerdwitluis.af_ZA
dc.format.extentvi, 9 p. : ill.
dc.identifier.urihttp://hdl.handle.net/10019.1/70289
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subjectGrapes -- Diseases and pests -- Controlen_ZA
dc.subjectMealybugs -- Controlen_ZA
dc.subjectMealybugs -- Insecticide resistanceen_ZA
dc.subjectChlorpyrifosen_ZA
dc.subjectDissertations -- Entomologyen_ZA
dc.subjectTheses -- Entomologyen_ZA
dc.titleSusceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifosen_ZA
dc.typeThesisen_ZA
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