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Insecticidal and synergistic activity of two monoterpenes against diamondback moth (Lepidoptera: Plutellidae)

Published online by Cambridge University Press:  02 January 2018

A.E. Webster ,
P. Manning Open the ORCID record for P. Manning [Opens in a new window] ,
J.M. Sproule ,
N. Faraone  and
G.C. Cutler
A.E. Webster
Affiliation:
Department of Plant, Food, and Environmental Sciences, Agricultural Campus, Dalhousie University, PO Box 550, Truro, Nova Scotia, B2N 5E3, Canada
P. Manning*
Affiliation:
Department of Plant, Food, and Environmental Sciences, Agricultural Campus, Dalhousie University, PO Box 550, Truro, Nova Scotia, B2N 5E3, Canada
J.M. Sproule
Affiliation:
Department of Plant, Food, and Environmental Sciences, Agricultural Campus, Dalhousie University, PO Box 550, Truro, Nova Scotia, B2N 5E3, Canada
N. Faraone
Affiliation:
Department of Plant, Food, and Environmental Sciences, Agricultural Campus, Dalhousie University, PO Box 550, Truro, Nova Scotia, B2N 5E3, Canada Department of Biology, Acadia University, 33 Westwood Ave, Wolfville, Nova Scotia, B4P 2R6, Canada
G.C. Cutler
Affiliation:
Department of Plant, Food, and Environmental Sciences, Agricultural Campus, Dalhousie University, PO Box 550, Truro, Nova Scotia, B2N 5E3, Canada
*
1Corresponding author (e-mail: paul.manning@dal.ca)
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Abstract

We examined the insecticidal activity of linalool and thymol, against diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae), and whether they would synergise the activity of spinosad against this pest. Both linalool and thymol were toxic to diamondback moth larvae by topical and oral exposure, but orders of magnitude less so than spinosad. We found that low concentrations of linalool weakly synergised spinosad, increasing its toxicity more than twofold. An interaction between spinosad, and acetone meant it was not possible to identify any potential synergisms between thymol and spinosad. Our results demonstrate limited potential for thymol and linalool to act as biopesticides or synergists for managing diamondback moth.

Type
Insect Management
Information
The Canadian Entomologist , Volume 150 , Issue 2 , April 2018 , pp. 258 - 264
Copyright
© Entomological Society of Canada 2018 

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Footnotes

Subject editor: Cécile Le Lann

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