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Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos
Thesis (MScAgric)--Stellenbosch University, 2004.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613811298533377 |
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| access_status_str | Open Access |
| author | De Wet, Owen |
| author2 | Pringle, K. L. |
| author_browse | De Wet, Owen Pringle, K. L. |
| author_facet | Pringle, K. L. De Wet, Owen |
| author_sort | De Wet, Owen |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScAgric)--Stellenbosch University, 2004. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/70289 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:42:04.592Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/70289 Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos De Wet, Owen Pringle, K. L. Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology. Grapes -- Diseases and pests -- Control Mealybugs -- Control Mealybugs -- Insecticide resistance Chlorpyrifos Dissertations -- Entomology Theses -- Entomology Thesis (MScAgric)--Stellenbosch University, 2004. ENGLISH 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. AFRIKAANSE 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. Masters 2012-08-27T14:03:51Z 2012-08-27T14:03:51Z 2004-03 Thesis http://hdl.handle.net/10019.1/70289 en_ZA Stellenbosch University vi, 9 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Grapes -- Diseases and pests -- Control Mealybugs -- Control Mealybugs -- Insecticide resistance Chlorpyrifos Dissertations -- Entomology Theses -- Entomology De Wet, Owen Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title | Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title_full | Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title_fullStr | Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title_full_unstemmed | Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title_short | Susceptibility of five strains of vine mealybugs, Planococcus ficus (Signoret), to chlorpyrifos |
| title_sort | susceptibility of five strains of vine mealybugs planococcus ficus signoret to chlorpyrifos |
| topic | Grapes -- Diseases and pests -- Control Mealybugs -- Control Mealybugs -- Insecticide resistance Chlorpyrifos Dissertations -- Entomology Theses -- Entomology |
| url | http://hdl.handle.net/10019.1/70289 |
| work_keys_str_mv | AT dewetowen susceptibilityoffivestrainsofvinemealybugsplanococcusficussignorettochlorpyrifos |