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SEASONAL ACTIVITY OF ADULT CARROT RUST FLIES, PSILA ROSAE (DIPTERA: PSILIDAE), IN THE LOWER FRASER VALLEY, BRITISH COLUMBIA1

Published online by Cambridge University Press:  31 May 2012

Gary J.R. Judd  and
Robert S. Vernon
Gary J.R. Judd
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6
Robert S. Vernon
Affiliation:
Research Station, Agriculture Canada, Vancouver, British Columbia V6T 1X2
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Abstract

Mean weekly catch of adult Psila rosae (F.) on sticky, yellow-painted cardboard traps from 93 commercial carrot fields provided seasonal records of their activity during 1980–1983 in the lower Fraser Valley, British Columbia. When monitoring extended from April through November in 1982 and 1983, 3 distinct periods of adult activity were observed that probably reflect the occurrence of 3 adult generations per year. Trap catch first peaked in mid- to late-May, followed by a second peak in late-July to early-August, and a third peak in mid-October. Of the temperature summations calculated, those commencing 1 February provided the most accurate degree-day (DD) indices for predicting seasonal activity of overwintering and 1st-generation adults. Four-year means for cumulative DD above 3 °C (air temperature) after 1 February for first, 10%, maximum, and 90% trap catch of the overwintering generation were 326, 435, 557, and 838 DD, respectively.

Résumé

Des pièges collants jaunes placés dans 93 champs de carottes ont servi à l'étude des cycles saisonniers de Psila rosae (F.) au cours des années 1980–1983 dans la vallée du bas Fraser en Colombie britannique. Lorsqu'en 1982 et 1983 le dépistage des adultes couvra la période avril–novembre, les moyennes hebdomadaires de captures révélèrent 3 phases distinctes d'activité. Celles-ci réflètent vraisemblablement l'apparition annuelle de 3 générations d'adultes. Les captures ont atteint un premier pic entre le milieu et la fin de mai, suivi d'un second entre la fin de juillet et le début d'août ainsi qu'un troisième à la mi-octobre. De toutes les sommations de températures calculées, celles utilisant le 1ier février comme date initiale procurent les meilleures valeurs de degrés-jours (DJ) pour prédire les activités saisonnières des adultes des générations hivernante et de mi-saison. Ces valeurs – basées sur 4 ans de données – ont été calculées pour la génération hivernante utilisant un seuil de 3 °C (T° air). Des accumulations de 326, 435, 838 et 557 DJ ont été obtenues pour : la 1ière capture, 10% et 90% des captures totales et le maximum de captures/piège/jour, respectivement.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 3 , March 1985 , pp. 375 - 381
Copyright
Copyright © Entomological Society of Canada 1985

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