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EFFECTS OF ATTRACTANT COMPOSITION AND RELEASE RATE ON ATTRACTION OF MALE CHORISTONEURA RETINIANA, C. OCCIDENTALS, AND C. CARNANA (LEPIDOPTERA : TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

Andrew M. Liebhold  and
W. Jan A. Volney
Andrew M. Liebhold
Affiliation:
Division of Entomology and Parasitology, University of California, Berkeley, California 94720
W. Jan A. Volney
Affiliation:
Division of Entomology and Parasitology, University of California, Berkeley, California 94720
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Abstract

Attraction of male Choristoneura spp. to various mixtures of the pheromone components of C. occidentalis Freeman and C. retiniana (Walsingham) released at various rates was evaluated at several sites in western North America. At all but 1 location, male trap capture increased with progressively greater release rates of a 92:8 mixture of (E)- and (Z)-11-tetradecenals (TDALs), previously identified as active components of the attractant pheromone of C. occidentalis. Similarly, trap catch was positively correlated with release rate of an 84:7:8:1 mixture of (E)- and (Z)-11-tetradecenyl acetates and (E)- and (Z)-11-tetradecenols (1:0.1 TDACs:TDOLs), previously identified as active components of the attractant pheromone of C. retiniana. All release rates of TDALs attracted only C. carnana (C. occidentalis and C. carnana probably are subspecies of the same species) in the central Sierra Nevada, but in the southern Cascades all but the lowest release rate of TDALs attracted significant numbers of males classified as C. retiniana in addition to those classified as C. occidentalis. At all locations, 1:0.1 TDACs: TDOLs exhibited complete species specificity, attracting only C. retiniana at all release rates tested. The 1:0.1 ratio of TDACs: TDOLs was the most attractive mixture of these components to C. retiniana. Addition of 1:0.1 TDACs: TDOLs did not significantly affect attraction of C. carnana to TDALs. However addition of TDALs significantly decreased attraction of C. retiniana to 1:0.1 TDACs:TDOLs.

Résumé

L'attraction des mâles de Choristoneura spp. à divers mélanges des composantes phe-romonales de C. occidentalis Freeman et de C. retiniana (Walsingham) libérés à divers taux a été évaluée à divers sites dans l'ouest de l'Amérique du Nord. A tous les sites sauf un, les captures de mâles ont augmenté progressivement avec le taux de libération d'un mélange 92 : 8 du (E)- et du (Z)-11-tétradécenal (TDALs), identifiés au préalable comme composantes actives de la pheromone d'attraction de C. occidentalis. De même, les captures étaient positivement corrélées au taux de libération d'un mélange 84 : 7 : 8 : 1 des (E) et (Z)-11-tétradécanyl acétate et des (E)- et (Z)-11-tétradécenols (1 : 0.1 TDACs : TDOLs), identifiés au préalable comme composantes actives de la pheromone de C. retiniana. A tous les taux de libération, les TDALs n'ont attiré que C. carnana (C. occidentalis et C. carnana sont probablement des sous-espèces de la même espèce) au centre de la Sierra Nevada; mais dans les Cascades du Sud, les TDALs ont attiré, à tous les taux sauf le plus bas, des nombres importants de mâles classés C. retiniana en plus des C. occidentalis. A tous les sites, les 1 : 0.1 TDACs : TDOLs ont montré une spécificité totale, n'attirant que des C. retiniana à tous les taux testés. Le rapport 1 : 0.1 de TDACs : TDOLs a produit le mélange le plus attractif de ces composantes envers C. retiniana. L'addition de 1 : 0.1 TDACs : TDOLs aux TDALs n'en a pas modifié signi-ficativementl'attractivitépourC. carnana. Cependant, l'addition des TDALs aux 1 : 0.1 TDACs : TDOLs en a significativement diminué l'attractivité pour C. retiniana.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 4 , April 1985 , pp. 447 - 457
Copyright
Copyright © Entomological Society of Canada 1985

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