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Pheromone content of azinphosmethyl-susceptible and -resistant obliquebanded leafrollers (Lepidoptera: Tortricidae) as a function of time of day and female age

Published online by Cambridge University Press:  31 May 2012

Ashraf M. El-Sayed  and
R.M. Trimble
Ashraf M. El-Sayed*
Affiliation:
Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, PO Box 6000, Vineland Station, Ontario, Canada L0R 2E0
R.M. Trimble
Affiliation:
Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, PO Box 6000, Vineland Station, Ontario, Canada L0R 2E0
*
1 Corresponding author.
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Abstract

The effect of time of day and age on the amounts and ratios of four pheromone compounds [(Z)-11-tetradecenyl acetate (Z11-14:Ac), (E)-11-tetradecenyl acetate (E11-14:Ac), (Z)-11-tetradecenol (Z11-14:OH), and (Z)-11-tetradecenal (Z11-14:Al)] was compared in azinphosmethyl-susceptible (susceptible) and -resistant (resistant) female obliquebanded leafrollers, Choristoneura rosaceana (Harris). The amounts of all four pheromone compounds varied during the hour before and five hours after the onset of scotophase. The glands of resistant females contained approximately one half the amount of Z11-14:Ac and Z11-14:OH as the glands of susceptible females during the second and third hours of scotophase, and between 50 and 70% as much Z11-14:Al as the glands of susceptible females during the hour before and second to fourth hours of scotophase. The glands of susceptible and resistant females contained similar amounts of E11-14:Ac. The relative amounts of each of the four pheromone compounds were affected by time of day but not by resistance status. There was a negative linear relationship between the amounts of each of the four compounds and female age in both types of females. The amounts of Z11-14:Ac and E11-14:Ac declined at similar rates with age in susceptible and resistant females; the amounts of Z11-14:OH and Z11-14:Al declined more rapidly with age in susceptible than in resistant females. The relative amounts of the four compounds were not affected by female age. Temporal variation in the relative amounts of pheromone in susceptible and resistant C. rosaceana may be associated with similar variation in the emission of pheromone and corresponding temporal variation in the relative attractiveness of the two types of females.

Résumé

Nous avons comparé les effets du moment de la journée et de l’âge des femelles sur les quantités de quatre phéromones [d’acétate de (Z)-11-tétradécényle (Z11-14 : Ac), de (E)-11-tétradécényle (E11-14 : Ac), de (Z)-11-tétradécénol (Z11-14 : OH) et de (Z)-11-tétradécénal (Z11-14 : Al)] et sur les rapports entre elles chez des tordeuses à bandes obliques [Choristoneura rosaceana (Harris)] sensibles et des tordeuses résistantes à l’azinphosméthyle. Les quantités des quatre phéromones variaient au cours de l’heure précédant la scotophase et au cours des premières 5 h de la scotophase. Les glandes des femelles résistantes contenaient environ la moitié de la Z11-14 : Ac et de la Z11-14 : OH contenues dans les glandes des femelles sensibles durant la deuxième et la troisème heures de la scotophase et de 50 à 70% de la quantité de Z11-14 : Al enregistrée chez des femelles sensibles au cours de l’heure précédant la scotophase et de la deuxième à quatrième heures de la scotophase. Les glandes des femelles sensibles et des femelles résistantes contenaient des quantités semblables de E11-14 : Ac. Les quantités relatives de chacune des quatre phéromones variaient selon l’heure du jour, mais elles n’étaient pas affectées par la présence ou l’absence de résistance. Il y avait une relation linéaire négative entre les quantités de chacune des quatre hormones et l’âge des femelles chez les deux types de femelles. Les quantités de Z11-14 : Ac et de E11-14 : Ac diminuaient en fonction de l’âge des femelles, au même rythme chez les femelles sensibles et chez les femelles résistantes; la Z11-14 : OH et la Z11-14 : Al diminuaient plus rapidement avec l’âge chez les femelles sensibles que chez les femelles résistantes. L’âge des femelles n’affectait pas les quantités relatives des quatre phéromones. Les variations temporelles des quantités relatives de phéromones chez les C. rosaceana résistantes ou sensibles sont peut-être associées à une variation parallèle de l’émission de phéromones et, par le fait même, à la variation temporelle du pouvoir d’attraction des femelles des deux types.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 134 , Issue 3 , June 2002 , pp. 331 - 341
Copyright
Copyright © Entomological Society of Canada 2002

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