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Effects of tebufenozide on the assemblage of moths (Lepidoptera) in an operational spruce budworm (Lepidoptera: Tortricidae) suppression programme

Published online by Cambridge University Press:  16 July 2019

Richard Westwood*
Affiliation:
Centre for Forest Interdisciplinary Research, University of Winnipeg, Winnipeg, Manitoba, R3B 2E9, Canada
Diana Saunders
Affiliation:
Centre for Forest Interdisciplinary Research, University of Winnipeg, Winnipeg, Manitoba, R3B 2E9, Canada
Alana R. Westwood
Affiliation:
Department of Biology, University of Winnipeg, Winnipeg, Manitoba, R3B 2E9, Canada
Neil J. Holliday
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
*
1Corresponding author (e-mail: r.westwood@uwinnipeg.ca)

Abstract

Tebufenozide (Mimic) kills Lepidoptera larvae that ingest it. Aerial applications of tebufenozide were made against spruce budworm (Choristoneura fumiferana (Clemens)) (Lepidoptera: Tortricidae) in boreal forest in Manitoba, Canada, in 1999 and 2000. In 2000 and 2001, moths in sprayed and unsprayed plots were sampled with light traps; trapping was supplemented by foliage sampling. Relative to unsprayed plots, catches of spruce budworm moths in plots sprayed in 1999 and 2000 were depressed in 2000, but not in 2001. Host tree defoliation was reduced in 2000 by 1999 and 2000 applications; the 2000 application reduced numbers of spruce budworm larvae in 2000 and 2001. Multivariate analysis revealed negative effects of tebufenozide application on two species of non-target moths in 2000 and no negative effects in 2001. Negatively affected species have larvae feeding in the tree canopy at the time of spray application. Higher catches of non-target species in sprayed treatments were observed for three species in 2000 and two species in 2001. We conclude that tebufenozide can depress the numbers of spruce budworm larvae and provide foliage protection during the year of application and the following year, and that negative effects on non-target species are detectable for about 15 months after application.

Type
Insect Management
Copyright
© Entomological Society of Canada 2019 

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Footnotes

Subject editor: Rob Johns

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