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SENSITIVITY OF BLUEBERRY LEAFTIER MOTHS (LEPIDOPTERA: TORTRICIDAE) (KEARFOTT) TO THEIR OWN SEX PHEROMONE: MATING BIOASSAY, ELECTROANTENNOGRAM, AND TRAP ATTRACTANCY STUDIES

Published online by Cambridge University Press:  31 May 2012

B.M. Ponder  and
W.D. Seabrook
B.M. Ponder
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1
W.D. Seabrook
Affiliation:
Department of Biology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 6E1
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Abstract

A mating suppression bioassay, an electroantennogram study, and a lure attractancy study demonstrated the sensitivity of the Croesia curvalana (Kft.) moth to the female sex pheromone. Mating suppression of 98% was achieved with source concentrations of 30 μg of either (E)- and (Z)-11-tetradecenal (95:5) or the natural pheromone blend of (E)- and (Z)-11-tetradecenal (90:10) + (E)- and (Z)-11-tetradecenyl acetate (85:15) (aldehyde:acetate = 9:1), and was 60% with a source concentration of 0.6 μg. Source concentrations of the minor component acetate, ranging from 15 to 0.6 μg, produced mating suppressions of from 78 to 38%. Male antennae responded to source concentrations of 2 × 10−10 mg (E)- and (Z)-11-tetradecenal (90:10) and antennal saturation occurred at 2 × 10−4 mg. Little female response was found at any age. Polyvinyl chloride lures releasing 1–2 ng/h captured males at approximately the same rate as did virgin moths. Release rates as low as 8 ng/h reduced trap capture from the 4 ng/h release rate found to be most effective under prevailing environmental conditions using Pherocon 1C traps. Results from these studies suggest C. curvalana could be a candidate for pheromone-based field mating suppression.

Résumé

Une étude de titrage biologique à supprimer l’accouplement, une étude d’électroantennogramme, et une étude d’attirance d’appât ont démontré la sensibilité de l’adulte de Croesia curvalana (Kft.) à la phéromone sexuelle femelle. La suppression d’accouplement au montant de 98% a été obtenue avec les concentrations de la source de 30 μg soit de l’(E)- et du (Z)-11-tétradécénal (95 : 5) ou du mélange naturel de la phéromone de l’(E)- et du (Z)-11-tétradécénal (90 : 10) + l’acétate de l’(E) et du (Z)-11-tétradécényl (85 : 15) (acétaldéhyde : acétate = 9 : 1), et a été de 60% avec une concentration de la source de 0,6 μg. Les concentrations à la source du composant le plus petit de l’acétate, variant de 15 à 0,6 μg, ont eu comme résultats les suppressions de 78 à 38%. L’antenne mâle a réagi contre une source de concentrations de 2 × 10−10 mg de l’(E)- et du (Z)-11-tétradécénal (90 : 10) et la saturation de l’antenne a eu lieu à 2 × 10−4 mg. Peu de réaction femelle n’a été découverte à aucun stade. Autant de mâles ont été pris par les appâts de chlorure du polyvinyle qui émettaient d’un à 2 ng/h que par les femelles adultes vierges. Les concentrations de relâchement aussi basses que de 8 ng/h ont réduit les prises par les pièges de celles avec une concentration de relâchement de 4 ng/h, qui a été trouvée la concentration la plus efficace sous les conditions courantes d’environnement en utilisant les pièges Pherocon 1C. Les résultats suggèrent que C. curvalana pourrait se porter candidat des essais de suppression d’accouplement sur le terrain.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 1 , February 1991 , pp. 231 - 238
Copyright
Copyright © Entomological Society of Canada 1991

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