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SEX PHEROMONE COMPONENTS OF THE OAK LEAF SHREDDER, CROESIA SEMIPURPURANA (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

P.J. Silk ,
L.P.S. Kuenen ,
A.R. Alford ,
G.C. Lonergan  and
G.G. Grant
P.J. Silk
Affiliation:
Pheromone Research Group, Chemical and Biotechnical Services, Research and Productivity Council, 921 College Hill Road, Fredericton, New Brunswick, Canada E3B 6Z9
L.P.S. Kuenen
Affiliation:
Pheromone Research Group, Chemical and Biotechnical Services, Research and Productivity Council, 921 College Hill Road, Fredericton, New Brunswick, Canada E3B 6Z9
A.R. Alford
Affiliation:
Pheromone Research Group, Chemical and Biotechnical Services, Research and Productivity Council, 921 College Hill Road, Fredericton, New Brunswick, Canada E3B 6Z9
G.C. Lonergan
Affiliation:
Pheromone Research Group, Chemical and Biotechnical Services, Research and Productivity Council, 921 College Hill Road, Fredericton, New Brunswick, Canada E3B 6Z9
G.G. Grant
Affiliation:
Pheromone Research Group, Chemical and Biotechnical Services, Research and Productivity Council, 921 College Hill Road, Fredericton, New Brunswick, Canada E3B 6Z9
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Abstract

Using gas chromatography and gas chromatography – mass spectrometry analyses of sex pheromone gland volatiles, we identified E- and Z-11-tetradecenals (E:Z-11-14:Aid) in an 85:15 blend of E:Z as the primary sex pheromone components of Croesia semipurpurana (Kearfott). Similar chemical analyses of sex pheromone gland extracts indicated the presence of the congeneric acetates (85:15 E:Z-11-14:Ac) and their saturated analogue (14:Ac); in addition, 85:15 E:Z-11-14:Alds were present at 5% of the acetates. The E:Z-11-14:Alds alone elicited trap capture; admixtures of saturated and unsaturated acetate analogues exhibited no significant synergistic or inhibitory effects. PVC rods with an 85:15 E:Z-11-14:Ald blend is recommended as a trap bait for monitoring population trends. It is unknown whether or not the components identified here represent the complete pheromone blend of this species; data from traps suspended 1.5 m above the ground versus those suspended 10 m above the ground suggest that future field studies may need to be conducted with traps positioned in the tree canopy.

Résumé

En utilisant la chromatographie en phase gazeuse et des analyses par chromatographie en phase gazeuse – spectometrie demasse des volatiles des phéromones de glandes sexuelles, nous avons identifié le E- et Z-11-tétradécenal (E : Z-11-14 : Ald dans un mélange 85 : 15 E : Z étant le principal constituant des phéromones sexuels Croesia semipurpurana (Kearfott). Des analyses chimiques similaires sur des extraits glandulaires des phéromones sexuels ont indiqué la présence d’acétates congénériques (85 : 15 E : Z-11-14 : Ac) et de leurs analogues saturés (14 : Ac); de plus, le 85 : 15 E : Z-11-14 : Ald représentait 5% des acétates. Le E : Z-11-14 : Ald seul provoque la capture par piègage; des mélanges d’analogues d’acétates saturés et insaturés n’ont démontré aucun effet synergetique ou inhibitoire. Une tige de PVC avec un mélange 85 : 15 E : Z-11-14 : Ald est recommandée comme appât pour pièges afin de suivre l’évolution des populations. À ce moment-ci, il est inconnu si les constituants identifiés représentent le mélange complet des phéromones de cette espèce; des tendances contradictoires à l’analyse des données de piègage entre des pièges suspendues à 1,5 m versus 10 m au dessus du sol suggèrent que de futures études sur le terrain peuvent être requises avec des pièges positionnés dans le couvert des arbres.

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 6 , December 1997 , pp. 1001 - 1008
Copyright
Copyright © Entomological Society of Canada 1997

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