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Published online by Cambridge University Press:  31 May 2012

Robert S. Vernon
Pacific Agriculture Research Centre, Agriculture and Agri-Food Canada, Agassiz, British Columbia, Canada V0M 1A0
James S. Broatch
County of Grande Prairie No. 1, Alberta, Canada T8V 4C5


The responses of adult cabbage maggot [Delia radicum (L.)], turnip maggot [D. floralis (Fallén)], radish maggot [D. planipalpis (Stein)], and seedcorn maggot [D. platura (Meigen)] to sticky traps painted blue, yellow, green, non-UV-reflecting white, or UV-reflecting white, were determined in a field of canola (Brassica rapa cv. Tobin) at the rosette and flowering stages. Traps colored white, blue, or yellow generally caught higher numbers of D. radicum, D. floralis, and D. planipalpis than did traps colored green or UV-reflecting white. Depending on the crop developmental stage and its background color, response to color sometimes differed both within and between the sexes. This was most pronounced for D. floralis, for which blue and white traps were preferred by males at the rosette stage but not die flowering stage, and for which white, but not blue, traps were preferred by females at the rosette siage. White and blue, but not yellow, were the colors preferred by male and female D. platura in our study, with UV-reflecting white also being preferred by males during the flowering stage. It was observed dial catches on white and yellow traps were often significantly different and [hat white versus yellow preferences could be reversed within or between males and females of certain species during the rosette or flowering stages. The data suggest dial the concurrent use of white and yellow sticky traps should be considered when conducting relative abundance surveys of Delia spp. in canola fields.


Les réactions des adultes de plusieurs espèces de Delia, la Mouche du chou [Delia radicum (L.)], la Mouche du navet [D. floralis (Fallén)], la Mouche du radis [D. planipalpis (Siein)] et la Mouche des semis [D. platura (Meigen)], à des pièges collants peints en bleu, jaune, vert, blanc ne réfléchissant pas l’ultra-violet et blanc réfléchissant l’ultra-viol et, ont été étudiées dans un champ de colza (Brassica rapa cv. Tobin) en fleurs et en rosettes. Les pièges peints en blanc, bleu ou jaune ont capturé des nombres plus élevés de D. radicum, D. floralis, et D. planipalpis que les pièges peints en vert ou en blanc réfléchissant l’ultra-violet. Selon le stade de développement de la plante et la couleur du fond, les réactions aux différentes couleurs variaient entre individus et entre sexes. Cela était particulièrement évident chez D. floralis dont les mâles préféraient les pièges bleus ou blancs lorsque la plante était en rosettes, mais pas au stade de la floraison, et dont les femelles préféraient les pièges blancs, mais n’avaient pas de préférence pour les pièges bleus au stade de rosette de la plante. Le blanc et le bleu, mais pas le jaune, ont été les couleurs préférées par les mâles et les femelles de D. platura au cours de notre étude : de plus, le blanc réfléchissant l’ultra-violet était également préféré par les mâles au moment de la floraison de la plante. Nous avons constaté que les captures aux pièges blancs et aux pièges jaunes différaient signifïcativement et que les préférences pour le blanc ou le jaune pouvaient être inversées chez les mâles et les femelles ou chez différents individus des deux sexes au cours des stades de rosette ou de floraison. Nos données indiquent que l’utilisation combinée de pièges blancs et de pièges jaunes est à conseiller pour l’évaluation de l’abondance relative des espèces de Delia dans les champs de colza.

[Traduit par la Rédaction]

Copyright © Entomological Society of Canada 1996

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