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Parasitism of the castor whitefly, Trialeurodes ricini (Homoptera: Aleyrodidae) by Encarsia formosa (Hymenoptera: Aphelinidae): bionomics in relation to temperature

Published online by Cambridge University Press:  10 July 2009

Parviz Shishehbor  and
Paddy A. Brennan
Parviz Shishehbor*
Affiliation:
Department of Environmental Resource Management, University College Dublin, Ireland
Paddy A. Brennan
Affiliation:
Department of Environmental Resource Management, University College Dublin, Ireland
*
P. Shishehbor Department of Environmental Resource Management, University College Dublin, Belfield, Dublin 4, Ireland.
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Abstract

Selected life history characteristics of Encarsia formosa Gahan parasitizing the castor whitefly, Trialeurodes ricini (Misra) were studied at three constant temperatures (20, 25 and 30°C). Egg-to-adult developmental time decreased from 32 days at 20°C to 13 days at 30°C. An average of 241 day-degrees was required to complete development above the lower threshold temperature (12°C). Juvenile mortality was 34, 40 and 47% at 20, 25 and 30°C, respectively. Mean longevity of E. formosa ranged from 7.7 days at 20°C, to 2.6 days at 30°C. Mean total fecundity ranged from 18 to 36 eggs/female. Intrinsic rate of increase (rm) increased with temperature from 0.065/day at 20°C to 0.169/day at 30°C. Generation times decreased from 37 to 14.5 days with increasing temperature.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 86 , Issue 1 , February 1996 , pp. 67 - 72
Copyright
Copyright © Cambridge University Press 1996

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