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THE USE OF DEGREE-DAYS TO PREDICT EMERGENCE OF THE APPLE MAGGOT, RHAGOLETIS POMONELLA (DIPTERA: TEPHRITIDAE), IN ONTARIO

Published online by Cambridge University Press:  31 May 2012

J. E. Laing  and
J. M. Heraty
J. E. Laing
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
J. M. Heraty
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario N1G 2W1
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Abstract

Adult flies of the apple maggot, Rhagoletis pomonella (Walsh), were monitored for 6 years at Guelph, Ontario using aerial and ground-emergence traps. Two degree-day (°D) models to predict adult emergence were tested. Fifty percent of the adults were captured in an average of 809 ± 50 (SD) °D8.7 and first capture was at 638 ± 60°D6.4. Degree-day models which have been proposed previously and those developed in this study were only slightly more accurate than average calendar date for predicting adult emergence. Differences in °D requirements for emergence in each year were correlated with the length of cold period and the correlation suggested that the length of cold period preceding morphogenesis affects either the number of °D required to complete postdiapause development or the threshold temperature for development.

Résumé

Les adultes de la mouche de la pomme, Rhagoletis pomonella (Walsh), ont été suivis pendant six ans à Guelph, Ontario à l'aide de pièges à émergence placés au dessus ainsi qu'au niveau du sol. Deux modèles basés sur les degrés-jours (°D), destinés à prédire l'émergence des adultes, ont été testés. Cinquante pourcent des adultes ont été capturés après 809 ± 50 (DS) °D8.7 en moyenne, la première capture ayant été effectuée à 638 ± 60°D6.4. Les modèles basés sur les degrés-jours proposés auparavant, de même que ceux présentés ici, sont seulement un peu plus précis que la date approximative pour prévoir l'émergence des adultes. Les différences entre années pour les °D nécessaires à l'émergence étaient corrélés avec la durée de la période de froid et la corrélation indique que la durée du refroidissement précédant la morphogénèse affecte soit le nombre de °D requis pour compléter le développement post-diapause, soit le seuil thermique du développement.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 8 , August 1984 , pp. 1123 - 1129
Copyright
Copyright © Entomological Society of Canada 1984

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