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SEASONAL OCCURRENCE AND INFESTATION POTENTIAL OF CABBAGE MAGGOT, DELIA RADICUM (L.) (DIPTERA: ANTHOMYIIDAE), ATTACKING RUTABAGA IN MANITOBA AS DETERMINED BY CAPTURES OF FEMALES IN WATER TRAPS1

Published online by Cambridge University Press:  31 May 2012

G.K. Bracken
G.K. Bracken
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The seasonal activity and infestation potential of the cabbage maggot, Delia radicum (L.) (Diptera: Anthomyiidae), attacking rutabaga was studied at two Manitoba locations over 4 years based on captures of females in yellow water traps baited with alryl isothiocyanate. The activity peak for the overwintering generation occurred on 8 June ± 4.1 days (mean ± SD), with degree-day accumulations, base 5°C, of 159 ± 6.2 for soil at 5 cm and 387 ± 69.4 for air for both locations combined. The activity peak for the first generation occurred on 12 August ± 11.7 days with degree-day accumulations of 981 ± 229.3 and 1295 ± 175.7 for soil and air temperatures, respectively.

Correlations between numbers of females trapped per week and of eggs in soil samples from around rutabaga plants for individual seasons at the two locations generally were not significant. A regression of numbers of eggs on females trapped based on all data was significant but had a low coefficient of determination (r2 = 0.289). The water traps are adequate for monitoring seasonal activity of adult flies but the captures are unreliable as quantitative indicators of potential infestation.

Résumé

L’activité saisonnière et l’infectiosité de la mouche du chou Delia radicum (L.) (Diptères : Anthomyiidae) qui s’attaque au rutabaga a été étudiée à deux endroits au Manitoba pendant 4 ans d’après les captures de femelles faites dans des pièges à eau jaunes appâtés d’isothiocyanate d’allyle. Le pic d’activité de la génération hivernante survient le 8 juin ± 4,1 jours (moyenne ± écart-type), avec des accumulations de degrés-jours 159 ± 6,2 (base de 5°C) à 5 cm dans le sol et de 387 ± 69,4 dans l’air pour les deux endroits combinés. Le pic d’activité pour la première génération survient le 12 août ± 11,7 jours avec des accumulations de degrés-jours de 981 ± 229,3 et de 1295 ± 175,7 pour les températures du sol et de l’air respectivement.

Les corrélations entre le nombre de femelles piégées par semaine et le nombre d’oeufs dans les échantillons de sol prélevés autour des plans de rutabaga chaque saison aux deux endroits ne sont généralement pas significatives. La régression du nombre d’oeufs des femelles piégées, fondée sur toutes les données, est significative, mais à un coefficient de détermination faible (r2 = 0,289). Les pièges à eau suffisent à surveiller l’activité saisonnière des mouches adultes, mais les captures ne sont pas fiables comme indicateurs quantitatifs d’une infestation potentielle.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 7 , July 1988 , pp. 609 - 614
Copyright
Copyright © Entomological Society of Canada 1988

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