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DIAPAUSE TERMINATION AND THE THERMAL REQUIREMENTS FOR POSTDIAPAUSE DEVELOPMENT IN SIX ONTARIO POPULATIONS OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (LEPIDOPTERA: GRACILLARIIDAE)

Published online by Cambridge University Press:  31 May 2012

R. M. Trimble
R. M. Trimble
Affiliation:
Research Station, Agriculture Canada, Vineland Station, Ontario L0R 2E0
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Abstract

The timing of diapause termination and the thermal characteristics of postdiapause development were compared in six Ontario populations of the spotted tentiform leafminer, Phyllonorycter blancardella (Fabr.). The populations studied were from the major apple growing areas which are located in four climatically different zones. Pupae of all populations collected in the fall and stored under simulated overwintering conditions had terminated diapause by the end of January. Pupae overwintering under natural conditions had also terminated diapause by this time. Significant population differences occurred in the postdiapause developmental threshold (t0) and thermal constant (K). Simulating postdiapause development and emergence of the six populations using the 1981 temperature records from one location resulted in a 9-day difference between the earliest and latest mean emergence times. The implications of these results for pest management are discussed.

Résumé

On a comparé la synchronisation de la fin de la diapause et les aspects thermiques du développement après diapause de six populations de la mineuse du pommier, Phyllonorycter blancardella (Fabr.), en Ontario. Les populations étudiées provenaient des principales régions productrices situées dans quatre zones climatiques différentes. Les pupes de toutes les populations, récoltées à l'automne et conservées dans des conditions d'hivernage simulées, avaient terminé leur diapause à la fin de janvier. Les pupes hivernées naturellement avaient également terminé leur diapause à la même époque. On observe des différences significatives entre les populations dans le seuil de développement après diapause (t0) et la constante thermique (K). La simulation du développement après diapause et de l'émergence des six populations à l'aide des relevés de température de 1981 à un endroit a produit une différence de 9 jours entre les dates hâtives et tardives d'émergence moyenne. L'auteur étudie les conséquences de ces résultats dans la lutte antiparasitaire raisonnée.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 4 , April 1983 , pp. 387 - 392
Copyright
Copyright © Entomological Society of Canada 1983

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