Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande
Thesis (M. Sc.) -- University of Stellenbosch, 1996.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2012
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613932406964224 |
|---|---|
| access_status_str | Open Access |
| author | Badenhorst, Jacqueline Anne |
| author2 | Giliomee, J. H. |
| author_browse | Badenhorst, Jacqueline Anne Giliomee, J. H. |
| author_facet | Giliomee, J. H. Badenhorst, Jacqueline Anne |
| author_sort | Badenhorst, Jacqueline Anne |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (M. Sc.) -- University of Stellenbosch, 1996. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/55008 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:43:59.926Z |
| 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:10019.1/55008 A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande Badenhorst, Jacqueline Anne Giliomee, J. H. Stellenbosch University. Faculty of AgriSciences. Dept. of Agricultural Economics. Thrips -- Effect of temperature on Thrips -- Development Thrips -- Reproduction -- Climatic factors Thrips -- Biological control Dissertations -- Agriculture Frankliniella occidentalis UCTD Thesis (M. Sc.) -- University of Stellenbosch, 1996. ENGLISH ABSTRACT: The effect of temperature on the development of Frankliniella occidentalis, Pergande on lima bean (Phaseolus limensis) leaf discs was investigated at five constant temperatures (15°, 18°, 22°, 25° and 30°C). Further studies examined the effect of temperature on reproduction and population growth at three constant temperatures (18°, 25° and 30°C). Life table studies showed that adult longevity and developmental rate of each life stage were inversely related to temperature. The prepetual and pupal stages showed greatest sensitivity to temperature. The nett replacement rate (R,) was highest at 25°C and th intrinsic rate of natural increase (r,) highest at 30°C. The generation time (T) declined with an increase in temperature. Fecundity of females peaked at 25°C. The minimum threshold for development was found to be 8.9°C and degree days for development ranged from 198.9 to 232.9. Populations of male and female F. occidentalis were monitored over an 18 month perdiod in a chrysanthemum glasshouse. Fluctuations in numbers female were significantly correlated to temperatures both within and outside the glasshouse, while male numbers showed no correlation at any time. Males outnumbered females at low population densities. When high numbers of thrips were caught, females formed more than 65% of the trapped individuals. The susceptibility of two strains F. occidentalis to endosulfan and formetanate was tested in residue on-glass bioassays in the laboratory. Diagnostic doses resulting in approximately 50 % and 90% mortality are proposed for endosulfan, namely 280 and 840 ppm a.i., respectively. Similarly diagnostic doses of 6 and 75 ppm a.i. are proposed for formetanate. AFRIKAANSE OPSOMMING: Die uitwerking van temperatuur op die ontwikkeling van Frankliniella occidentalis Pergande op boontjie (Phaseolus limensis) blaarskyfies is by vyf konstante temperature (15°, 18°, 22°, 25° and 30°C) bestudeer. Die effek van temperatuur op voortplanting en populasie-groei is ook by drie konstante temperature (18°, 25° and 30°C) bepaal. Volgens lewenstabelstudies nee die ouderdom van volwassenes, sowel as die ontwikkelingstempo met 'n toename in temperatuur af. Die pre-papie- en papiestadia het die hoogste sensitiwiteit teenoor temperatuur getoon. Die hoogste netto vervangingstempo (R,) is by 25°C verkry, terwyl die intrinsieke tempo van natuurlike toename (r,) die hoogste by 30°C was. Die generasietyd (T) het met 'n toename in temperatuur afgeneem. Vrugbaarheid het die hoogste vertoon by 25°C. Die drempelwaarde vir ontwikkeling was 8.9°C terwyl graaddae vir ontwikkeling tussen 198.0 en 232.9 gewissel het. Beide geslagte van F. occidentalis is oor 'n tydperk van 18 maande in 'n slaghuis, waarin krisante gekweek is, met behulp van geel kleefvalle gemonitor. 'n Betekenisvolle korrelasie is tussen die hoeveelheid wyfies wat gevang is en temperatuur gevind. Meer mannetjies as wysfies is in tye wanneer populasies laag was gevind. Wyfies het 65% of meer van die individue op die valle uitgemaak wanneer die populasie hoog was. Die vatbaarheid van twee rasse F. occidentalis vir endosulfan en formetanaat is met behulp van glasplaat-residu toetse in die laboratorium bepaal. Diagnostiese dossise wat nagenoeg 50 % en 90% mortaliteit tot gevolg gehad het, naamlik 280 en 840 dpm aktief, onderskeidelik, is vir endosulfan voorgestel. Diagnostiese dosisse van 6 75 dpm aktief is, op dieslefde manier, vir formetanaat voorgestel. Masters 2012-08-27T11:36:51Z 2012-08-27T11:36:51Z 1996 Thesis http://hdl.handle.net/10019.1/55008 en_ZA Stellenbosch University 72 pages : illustrations. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Thrips -- Effect of temperature on Thrips -- Development Thrips -- Reproduction -- Climatic factors Thrips -- Biological control Dissertations -- Agriculture Frankliniella occidentalis UCTD Badenhorst, Jacqueline Anne A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title | A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title_full | A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title_fullStr | A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title_full_unstemmed | A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title_short | A study of the biology and control of the western flower thrips, Frankliniella occidentalis Pergande |
| title_sort | study of the biology and control of the western flower thrips frankliniella occidentalis pergande |
| topic | Thrips -- Effect of temperature on Thrips -- Development Thrips -- Reproduction -- Climatic factors Thrips -- Biological control Dissertations -- Agriculture Frankliniella occidentalis UCTD |
| url | http://hdl.handle.net/10019.1/55008 |
| work_keys_str_mv | AT badenhorstjacquelineanne astudyofthebiologyandcontrolofthewesternflowerthripsfrankliniellaoccidentalispergande AT badenhorstjacquelineanne studyofthebiologyandcontrolofthewesternflowerthripsfrankliniellaoccidentalispergande |