Thesis (MSc)--University of Stellenbosch, 2000. / ENGLISH ABSTRACT: The development time, survival and fecundity of Trichogrammatoidea cryptophlebiae
Nagaraj a, an egg parasitoid of false codling moth, Cryptophlebia leucotreta Meyr., on .
citrus were determined at 15,20,25 and 30°C. Using these values the intrinsic rate of
increase (rm), mean generation time (T) and net replacement rate (Ra) were estimated
at the respective temperatures. In addition, the data were used to estimate the
minimum temperature required for development. The rmincreased from 15 (0,042) to
20°C (0,088) and then gradually decreased from 25 (0,069) to 30°C (0,012). The Ra
was highest at 20°C (3,116 females/female), followed by 15°C (2,607
females/female), 25°C (1,894 females/female) and 30°C (1,092 females/female). T
decreased as temperature increased from 7 days at 30°C to 22,79 days at 15°C. The
estimated minimum temperature for development was 7,65°C which implies that this
wasp should be able to survive and reproduce under normal winter conditions in the
Western Cape. / AFRIKAANSE OPSOMMING: Die ontwikkelingstyd, oorlewing en vrugbaarheid van Trichogrammatoidea
cryptophlebiae Nagaraj a, 'n eierparasitoied van valskodlingmot,
Cryptophlebia leucotreta Meyr., op sitrus is bepaal by 15, 20, 25 en 30oe.
Hierdie waardes is gebruik om die intrinsieke tempo van vermeerdering (rm),
die gemiddelde generasietyd (T) en die netto vervangingstempo (Ro) te bepaal
by die betrokke temperature. Die data is verder gebruik om die minimum
temperatuur vir ontwikkeling te bepaal. Die rm waarde het toegeneem van
15°e (0,042) tot by 200e (0,088) en afgeneem van 25°e (0,069) tot 300e
(0,012). Die Ro was die hoogste by 200e (3,116 wyfies/wyfie), gevolg deur
15°e (2,607 wyfies/wyfie), 25°e (1,894 wyfies/wyfie) en 300e (1,092
wyfies/wyfie). T het afgeneem met 'n toename in temperatuur en was 7 dae
by 300e en 22,79 dae by 15°e. Die beraamde minimum temperatuur vir
ontwikkeling was 7,65°e wat aandui dat hierdie wespe kan oorleef en
voortplant by normale wintertoestande in die Wes-Kaap.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/51712 |
| Date | 03 1900 |
| Creators | Matthee, Elsabe |
| Contributors | Pringle, K. L., Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology & Entomology. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | af_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 22 p. : ill. |
| Rights | Stellenbosch University |
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