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EFFECTS OF SEVERAL INSECT GROWTH REGULATORS ON EGG HATCH AND SUBSEQUENT DEVELOPMENT IN THE CABBAGE MAGGOT DELIA RADICUM (L.) (DIPTERA: ANTHOMYIIDAE)

Published online by Cambridge University Press:  31 May 2012

Terry-Lynn Young ,
Roger Gordon  and
Marcel Cornect
Terry-Lynn Young
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada AIB 3X9
Roger Gordon*
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada AIB 3X9
Marcel Cornect
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada AIB 3X9
*
1Author to whom reprint requests should be addressed.
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Abstract

Eggs (24–28 h old) of Delia radicum (L.) were treated with the same doses of diflubenzuron, methoprene, juvenile hormone I, or precocene II. Diflubenzuron significantly reduced egg hatching compared with untreated and solvent-treated controls. Methoprene had a delayed effect, preventing eclosion of adults from pupae that subsequently developed from treated eggs. A commercial formulation of diflubenzuron, Dimilin®, significantly suppressed and delayed hatching of eggs treated when 3–7 h old but not of eggs treated when 24–48 h old. Diflubenzuron may be as effective as the commercial insecticide carbofuran in protecting rutabaga slices from damage, as all larvae that did hatch died shortly afterwards.

Résumé

Des oeufs (24–48 h) de Delia radicum (L.) ont été traités avec des doses similaires de diflubenzuron, méthoprène, hormone juvénile I et précocène II. Le diflubenzuron a réduit significativement l’éclosion des oeufs par rapport à des témoins non-traités ou traités au solvant. Le méthoprène avait un effet retardé, empêchant l’émergence d’adultes issus de pupes provenant d’oeufs traités. Une préparation commerciale du diflubenzuron, le Dimilin®, a significativement réduit et retardé l’éclosion d’oeufs traités 3–7 h après l’éclosion, mais pas celle d’oeufs traités 24–48 h après. Le diflubenzuron peut être aussi efficace que le carbofuran du type commercial pour la prévention de dommages sur tranches de rutabaga, puisque toutes les larves qui ont éclos sont mortes peu après.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 5 , May 1987 , pp. 481 - 488
Copyright
Copyright © Entomological Society of Canada 1987

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