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DEVELOPMENT OF THE CARROT RUST FLY, PSILA ROSAE (DIPTERA: PSILIDAE), RELATIVE TO TEMPERATURE IN THE LABORATORY

Published online by Cambridge University Press:  31 May 2012

A. B. Stevenson
A. B. Stevenson
Affiliation:
Research Station, Agriculture Canada, Vineland Station, Ontario L0R 2E0
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Abstract

The effect of temperature on development of the carrot rust fly, Psila rosae (F.), was determined at constant temperatures in the laboratory. The relationship between rate of development and temperature was essentially linear from 10° to 17.5°C but began to diverge from linearity between 17.5° and 20°C. Estimated threshold temperatures (t) and thermal constants (K) for development of overwintered pupae were 2.3°C and 319 degree-days (dd) for first emergence and 1.8°C and 368 dd for 50% emergence. For laboratory-reared stages, t and K values were 4.1°C and 102 dd for egg hatch, 2.0°C and 642 dd for development from egg to mature larvae, and 3.0°C and 107 dd for pupation. Development in the laboratory from egg (less than 24 h old) to adult was completed in 59, 70, and 81 days at 20°, 17.5°, and 15°C respectively; no threshold or thermal constant was estimated because few or no individuals completed development to adult at 12.5° or 10°C within expected times, presumably because diapause was induced at these temperatures.

Résumé

On a déterminé l’effet de diverses températures constantes sur le développement de la mouche de la carotte, Psila rosae (F.), en laboratoire. Le rapport entre le taux de développement et la température est essentiellement linéaire de 10 à 17,5°C, mais commence à s’écarter de la linéarité de 17,5 à 20°C. Les températures seuils (t) et les constantes thermiques (K) estimatives pour le développement des pupes hivernées sont de 2,3°C et 319 degrés-jours (dj) pour le début d’émergence et de 1,8°C et 368 dj pour 50% d’émergence. Pour les stades de croissance passés en laboratoire, les valeurs de t et K sont de 4,1°C et 102 dj pour l’éclosion, 2,0°C et 642 dj pour l’intervalle entre l’œuf et la larve mature et 3,0°C et 107 dj pour la pupaison. En laboratoire, le développement de l’œuf (âgé de moins de 24 heures) à l’adulte prend 59, 70 et 81 jours à 20, 17,5 et 15°C respectivement; aucune température seuil ou constante thermique n’a été estimée à 12,5 ou 10°C car pratiquement pas de spécimens n’avaient terminé leur développement dans les délais prévus à ces températures, sans doute parce qu’elles prpvoquaienvur diapause.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 7 , July 1981 , pp. 569 - 574
Copyright
Copyright © Entomological Society of Canada 1981

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