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Multiple effects of tebufenozide on the survival and performance of the spruce budworm (Lepidoptera: Tortricidae)

Published online by Cambridge University Press:  03 October 2016

Kees van Frankenhuyzen  and
Jacques Régnière
Kees van Frankenhuyzen
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Quèbec, Quèbec, G1V 4C7, Canada
Jacques Régnière*
Affiliation:
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Quèbec, Quèbec, G1V 4C7, Canada
*
1Corresponding author (e-mail: Jacques.Regniere@canada.ca).
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Abstract

Aerial application of Mimic® 2LV to rising outbreak populations of the spruce budworm (Choristoneura fumiferana (Clemens); Lepidoptera: Tortricidae) in Québec, Canada, resulted in high levels of population reduction at spray deposits of 0.5–1.2 μg tebufenozide/g of foliage. Application to potted host trees in outdoor enclosures followed by bioassays revealed multiple effects on spruce budworm survival and recruitment. Chronic (14-day) exposure of late-instars to treated foliage reduced larval survival and also pupal survival, mating success, and fecundity, depending on the product concentration applied. Treatments that produced foliar deposits of ~ 0.5–1.5 μg tebufenozide/g caused high larval mortality. Exposure to deposits of ~ 0.15–0.5 μg/g caused delayed mortality during the pupal stage and reduced the mating success of survivors, while exposure to ~ 0.07–0.15 μg/g reduced the fecundity of mated females. Sublethal exposure did not affect the progeny of survivors, either in egg hatch, survival during diapause, or survival and performance after diapause. Reduced survival during late-larval and pupal stages combined with lower recruitment as a result of reduced mating success and fecundity are likely to play a role in the suppression of Mimic®-treated spruce budworm populations in the years following treatment.

Résumé

L’application aérienne de Mimic® 2LV sur des populations en croissance de la tordeuse des bourgeons de l’épinette (Choristoneura fumiferana (Clemens); Lepidoptera: Tortricidae) au Québec, Canada, a causé de forts taux de réduction des populations avec des dépôts de 0.5–1.2 μg de tébufenozide par g de feuillage. Des bioessais faits à la suite d’applications sur des arbres en pots dans des enclos extérieurs ont révélé de multiples effets sur la survie et le recrutement de la tordeuse. Une exposition chronique (14 jours) de larves d’âge avancé à du feuillage traité a réduit non seulement leur survie, mais également celle des chrysalides, le succès d’accouplement et la fécondité des survivants, selon la concentration appliquée. Des traitements produisant un dépôt foliaire de ~ 0.5–1.5 μg de tébufenozide par g ont causé une forte mortalité. L’exposition à un dépôt de ~ 0.15–0.5 μg par g a causé une mortalité retardée au cours de la pupaison et la réduction du succès d’accouplement des survivants. L’exposition à ~ 0.07–0.15 μg par g a quant à elle réduit la fécondité des femelles accouplées. L’exposition sous-létale n’a eu aucun effet sur la progéniture des survivants, que ce soit en termes d’éclosion des œufs, de survie en diapause ou de survie et performance post-diapause. La survie réduite des stades larvaires avancés et des chrysalides, combinée avec le recrutement réduit chez les survivants résultant des baisses de succès d’accouplement et de fécondité, contribuent vraisemblablement à la suppression des populations de tordeuse traitées au Mimic® au cours des années suivant les traitements.

Type
Insect Management
Information
The Canadian Entomologist , Volume 149 , Issue 2 , April 2017 , pp. 227 - 240
Copyright
© Her Majesty the Queen in Right of Canada 2016 

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Footnotes

Subject editor: Jon Sweeney

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