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Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards
Thesis (M. Sc.) -- University of Stellenbosch, 1998.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613923090366464 |
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| access_status_str | Open Access |
| author | Eyles, David Keith |
| author2 | Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology. |
| author_browse | Eyles, David Keith Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology. |
| author_facet | Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology. Eyles, David Keith |
| author_sort | Eyles, David Keith |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc.) -- University of Stellenbosch, 1998. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55875 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:43:50.825Z |
| 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:10019.1/55875 Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards Eyles, David Keith Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology. Codling moth -- Effect of chemicals on Codling moth -- Biological control Apples -- Diseases and pests -- Control Arthropod pests -- Biological control Dissertations -- Entomology Thesis (M. Sc.) -- University of Stellenbosch, 1998. The effects were investigated of reducing organophosphate spray applications used for the control of the key pest codling moth, Cydia pomonella (L.), on the arthropod fauna in apple orchards where a codling moth mating disruption programme using a synthetic female moth sex pheromone was introduced. Monitoring systems were used to quantify population levels of herbivorous and beneficial arthropods during the 1994/95 and 1995/96 seasons in orchards with low codling moth population levels in the Elgin area of the Western Cape, South Africa.The codling moth population was reduced to almost zero by the end of the second season where mating disruption was used, as indicated by very low trap catches and very low moth fruit damage. There was no pest population explosion owing to either an overall reduction in chemical control measures or to a change in the class of chemical used. In many cases no sprays were applied for known pests. Fruit damaged by codling moth did not abruptly increase due to a decrease in organophosphate use, indicating that an already low codling moth population can be further reduced using mating disruption and a greatly reduced spray programme. There were a number cases where increased levels of fruit damage were recorded at the end of the second season. The majority of insect-related fruit damage was caused by banded fruit weevil (Phlyctinus callosus (Schönherr)), American bollworm (Heliothis armigera (Hübner)) and the thrips (Thysanoptera) responsible for "dimpling" damage on fruit. Phytophagous mites, Tetranychus urticae Koch and Panonychus ulmi (Koch), were controlled by the predatory mite Amblyseius californicus (McGregor). Many apple leafroller larvae, (Tortrix capensana (Walker)), were parasitised. Green aphid (various species), fruit fly (Ceratitis rosa (Karsch), C. capitata (Wiedemann)) and mealybug (Pseudococcidae) remained at population levels below those which would have an economic impact. The number of woolly apple aphid, Eriosoma lanigerum (Hausmann), colonies in the trees increased, even though the proportion of colonies parasitised by Aphelinus mali Haldeman increased, indicating that woolly apple aphid may become more of a problem with additional seasons under mating disruption.Future success of codling moth mating disruption may depend on: the establishment of new economic damage thresholds for all pests which will allow for biological control to be enhanced; labour-efficient grower-friendly monitoring methods for all pests; an area-wide use of mating disruption to reduce costs and edge effects; and improved control of woolly apple aphid, the dimpling thrips and banded fruit weevil. Masters 2012-08-27T11:37:16Z 2012-08-27T11:37:16Z 1998 Thesis http://hdl.handle.net/10019.1/55875 en Stellenbosch University 60 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Codling moth -- Effect of chemicals on Codling moth -- Biological control Apples -- Diseases and pests -- Control Arthropod pests -- Biological control Dissertations -- Entomology Eyles, David Keith Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title | Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title_full | Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title_fullStr | Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title_full_unstemmed | Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title_short | Effects of mating disruption for codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), control on arthropod population and damage levels in apple orchards |
| title_sort | effects of mating disruption for codling moth cydia pomonella l lepidoptera tortricidae control on arthropod population and damage levels in apple orchards |
| topic | Codling moth -- Effect of chemicals on Codling moth -- Biological control Apples -- Diseases and pests -- Control Arthropod pests -- Biological control Dissertations -- Entomology |
| url | http://hdl.handle.net/10019.1/55875 |
| work_keys_str_mv | AT eylesdavidkeith effectsofmatingdisruptionforcodlingmothcydiapomonellallepidopteratortricidaecontrolonarthropodpopulationanddamagelevelsinappleorchards |