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Environmental effects on pre-imaginal development and survival of the castor whitefly, Trialeurodes ricini Misra

Published online by Cambridge University Press:  19 September 2011

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

The development time and survival of the castor whitefly, Trialeurodes ricini Misra were measured at four constant temperatures. The duration of the egg stage varied from 15 days at 20°C to 4.6 days at 35°C. No eggs hatched at a constant 40°C. The minimum temperature threshold for egg development was calculated to be 17°C. The total development time from egg to adult ranged from 54.4 days at 20°C to 16.8 days at 30°C. Development of the egg and the first-to fifth-instar larva required 63 and 180 degree-days respectively above the threshold value. Immature survival increased from 64.5% at 20°C to 92.8% at 30°C. Trialeurodes ricini is well adapted to high temperatures and may extend its distribution if mean world temperatures increase as a result of global warming.

Résumé

Le développement et la survie des Trialeurodes ricini Misra ont été étudiés sous quatres températures constantes de 20 à 35°C. La durée du développement de l'oeuf a varié de 15 jours (20°C) à 4,6 Jours (35°C). Une température constante de 40°C s'est montrée fatale pour les oeufs de T. ricini. Les seuils théoriques de températures pour le développement des oeufs ont été établis à 17°C. La durée du développement de l'oeuf adulte a varié de 54,4 jours (20°C) à 16,8 jours (30°C). Les besoins thermiques pour le développement des oeufs et des nymphes étaient de 63 et 180 degrés-jours au dessus la temperature du seuil. La survie augmente de 64,5% à 20°C, à 92,8% à 30°C. Trialeurodes ricini est bien adapté à des températures, ce qui pourrait résulter en une expansion des zones de prolifération de T. ricini si la température mondiale moyenne augmente, à cause de l'effet de serre.

Keywords

castor whiteflyTrialeurodes ricinidevelopmentsurvivalthreshold temperaturecastor whiteflyTrialeurodes ricinidéveloppementsurviela temperature du seuil
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 3-4 , December 1995 , pp. 325 - 331
Copyright
Copyright © ICIPE 1995

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