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Spruce budworm feeding and oviposition are stimulated by monoterpenes in white spruce epicuticular waxes

Title:

Spruce budworm feeding and oviposition are stimulated by monoterpenes in white spruce epicuticular waxes

Ennis, Darragh, Despland, Emma, Chen, Fei, Forgione, Pat and Bauce, Eric (2015) Spruce budworm feeding and oviposition are stimulated by monoterpenes in white spruce epicuticular waxes. Insect Science . n/a-n/a. ISSN 16729609

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Official URL: http://dx.doi.org/10.1111/1744-7917.12279

Abstract

Monoterpenes, source of the distinctive odor of conifers, are generally considered plant defensive compounds. However, they are also known to act as long‐range insect attractants, as they are volatile and permeate forest airspaces. Moreover, they are lipid soluble and can be absorbed into plant epicuticular waxes. We test their role in short‐range host plant choice by both adult females and larvae of a folivorous forest pest (Choristoneura fumiferana). We conducted laboratory assays testing the responses of Eastern spruce budworm to an artificial monoterpene mix (α‐pinene, β‐pinene, limonene, myrcene) and to white spruce (Picea glauca) epicuticular waxes in closed arenas. Ovipositing females preferred filter paper discs treated with P. glauca waxes to controls, and preferred the waxes + monoterpenes treatment to waxes alone. However, females showed no preference between the monoterpene‐treated disc and the control when presented without waxes. Feeding larvae prefered wax discs to control discs. They also consumed discs treated with realistic monoterpene concentrations and wax preferentially over wax‐only discs, but showed no preference between extremely high monoterpene concentrations and wax‐only controls. In an insect‐free assay, P. glauca epicuticular wax decreased monoterpene volatilization. These results suggest that P. glauca waxes and realistic concentrations of monoterpenes are stimulatory to both egg‐laying females and feeding larvae, and that their effects are synergistic.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Ennis, Darragh and Despland, Emma and Chen, Fei and Forgione, Pat and Bauce, Eric
Journal or Publication:Insect Science
Date:2015
Funders:
  • Natural Sciences and Engineering Research Council of Canada (NSERC)
  • Ministère des Ressources Naturelles et de la Faune du Québec
  • Canadian Forest Service
  • Societé de Protection des Forêts contre les Insectes et les Maladies du Québec
Digital Object Identifier (DOI):10.1111/1744-7917.12279
ID Code:981931
Deposited By: EMMA DESPLAND
Deposited On:30 Oct 2019 14:06
Last Modified:30 Oct 2019 14:08
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