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Captures of two leafroller moth species (Lepidoptera: Tortricidae) in traps baited with varying dosages of pheromone lures or commercial mating-disruption dispensers in untreated and pheromone-treated orchard plots

Published online by Cambridge University Press:  02 April 2012

L.L. Stelinski ,
J.R. Miller  and
L.J. Gut
L.L. Stelinski*
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan 48824, United States of America
J.R. Miller
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan 48824, United States of America
L.J. Gut
Affiliation:
Department of Entomology, Michigan State University, East Lansing, Michigan 48824, United States of America
*
1Corresponding author (e-mail: [email protected]).
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Abstract

A 2-year study conducted in 0.6-ha apple (Malus domestica Borkh.) blocks examined the effects of treatment with pheromone rope dispensers on captures of the obliquebanded leafroller, Choristoneura rosaceana (Harris, 1841), and the redbanded leafroller, Argyrotaenia velutinana (Walker, 1863), in traps baited with varying dosages of pheromone lures or Isomate®-OBLR/PLR Plus pheromone rope dispensers. In untreated blocks, captures of male A. velutinana were high and did not differ among (i) traps baited with a standard lure loading used to monitor this pest, (ii) lure loadings 10 and 100 times the standard loading, and (iii) traps baited with an Isomate-OBLR/PLR Plus pheromone rope dispenser. In pheromone-treated blocks, captures of A. velutinana in traps were reduced 94%–99% for all loadings tested (up to 1000 times the standard loading). The results for C. rosaceana were different. In untreated blocks in 2002, traps baited with 10 or 30 standard lures captured significantly more C. rosaceana than traps baited with a single standard lure; however, in 2003, traps baited with the standard lure loading captured significantly more moths than traps baited with 100 and 1000 times the standard loading. Also, traps baited with Isomate-OBLR/PLR Plus pheromone rope dispensers captured significantly fewer C. rosaceana than traps with standard lures in untreated blocks. In pheromone-treated blocks, traps baited with standard monitoring lures and lures with higher loadings (10 and 1000 times the standard) captured equivalent numbers of C. rosaceana; the capture of moths was reduced by only 50%–71%. We conclude that Isomate-OBLR/PLR Plus pheromone rope dispensers deployed in Michigan, United States of America, are effective in disrupting orientation of A. velutinana; however, they are not very effective for C. rosaceana. In addition, increasing lure loading above that of 1× monitoring lures (rubber septa or membrane type) does not appear to reliably increase the effectiveness of monitoring of males of either leafroller species in orchards where pheromone ropes are deployed at recommended densities.

Résumé

Une étude de 2 ans dans des parcelles de 0,6 ha de pommeraies (Malus domestica Borkh.) a permis d'évaluer les effets d'un traitement avec des diffuseurs de phéromone en corde sur les captures de la tordeuse à bandes obliques, Choristoneura rosaceana (Harris, 1841), et de la tordeuse à bandes rouges, Argyrotaenia velutinana (Walker, 1863), dans des pièges munis de doses diverses d'appâts de phéromone ou de diffuseurs en corde de la phéromone Isomate®-OBLR/PLR Plus. Dans les parcelles non traitées, les captures d'A. velutinana mâles sont élevées et elles ne varient pas entre (i) les pièges munis d'un appât couramment utilisé pour surveiller le ravageur, (ii) les pièges chargés de 10 et 100 fois l'appât standard et (iii) les pièges munis d'un diffuseur en corde d'Isomate-OBLR/PLR Plus. Dans les parcelles traitées à la phéromone, les captures ont été réduites de 94 % – 96 % pour toutes les doses utilisées, y compris une dose de 1000 fois la dose standard. Les résultats chez C. rosaceana sont différents. En 2002, dans les parcelles non traitées, les pièges garnis de 10 ou 30 appâts standard ont capturé significativement plus de C. rosaceana que les pièges avec un seul appât. En 2003, cependant, les pièges munis de la dose standard ont capturé significativement plus de papillons que les pièges garnis de doses 100 ou 1000 fois la dose standard. De plus, dans les parcelles non traitées, les pièges munis de diffuseurs de la phéromone Isomate-OBLR/PLR Plus ont capturé significativement moins de C. roseaceana que les pièges munis d'appâts standard. Dans les parcelles traitées à la phéromone, les pièges munis d'appâts standard de surveillance et les pièges garnis de doses 10 et 1000 fois la valeur standard ont capturé des nombres équivalents de C. rosaceana; les captures de papillons ont été réduites de seulement 50 % – 71 %. Nous concluons que les cordes garnies de phéromone Isomate-OBLR/PLR Plus perturbent effectivement l'orientation d'A. velutinana, mais pas celle de C. rosaceana. De plus, l'augmentation des doses des appâts (avec septum de caoutchouc ou membrane) au-dessus de la valeur standard (1×) pour l'observation ne semble pas augmenter de façon fiable l'efficacité de la surveillance des mâles chez ni l'une ni l'autre des espèces de tordeuses dans les vergers où on a posé des cordes de phéromone aux densités recommandées.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 137 , Issue 1 , February 2005 , pp. 98 - 109
Copyright
Copyright © Entomological Society of Canada 2005

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