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Timing of egg hatch by early-season codling moth (Lepidoptera: Tortricidae) predicted by moth catch in pear ester- and codlemone-baited traps

Published online by Cambridge University Press:  02 April 2012

A.L. Knight*
Affiliation:
Yakima Agricultural Research Laboratory, USDA–ARS, 5230 Konnowac Pass Road, Wapato, Washington 98951, United States of America
D.M. Light
Affiliation:
Western Regional Research Center, USDA–ARS, 800 Buchanan Street, Albany, California 94710, United States of America
*
1 Corresponding author (e-mail: [email protected]).

Abstract

The use of the timing of moth catch in traps to predict the start of egg hatch by first-generation codling moth, Cydia pomonella (L.), in apple, Malus domestica Borkh. (Rosaceae), was evaluated with ethyl (E,Z)-2,4-decadienoate (pear ester) and (E,E)-8,10-dodecadien-1-ol (codlemone) lures. Two sets of paired traps baited with either lure were placed in each of seven orchards and checked daily during the spring flight in 2000 and 2001. Rearing of field-collected eggs and sampling of fruit for injury were used to estimate the date of first egg hatch. Moth catch in traps baited with codlemone and pear ester occurred approximately 144 and 105 degree-days prior to the start of egg hatch, respectively. The effectiveness of using the timing of sustained moth catch in traps baited with these lures as a biological reference point (Biofix) to predict the start of egg hatch when traps were checked every 3–4 d was evaluated in 11 orchards from 2000 to 2002. The calendar date for the start of sustained moth catch in traps baited with either lure varied widely among orchards and years. Significant differences in mean cumulative degree-days from first sustained moth catch until egg hatch were found among male moth catch in codlemone-baited traps and total and female moth catch in pear ester-baited traps. Adjusting the Biofix based on daily temperature thresholds significantly changed the cumulative degree-days required until egg hatch only for female moth catch. No significant differences were found in the accuracy of predicting the date of egg hatch using either the codlemone or pear ester lure or by adjusting the Biofix date using daily temperature thresholds. The cumulative degree-day totals required from Biofix until egg hatch had the lowest variability when the Biofix was (i) based on the sustained catch of female moths in a pear ester-baited trap and (ii) adjusted with a temperature threshold for moth activity.

Résumé

Nous avons évalué l'utilisation de la phénologie des captures de papillons dans les pièges pour prédire le début de l'éclosion des oeufs chez les carpocapses de la pomme, Cydia pomonella (L.), de première génération sur le pommier, Malus domestica Borkh. (Rosaceae), à l'aide d'appâts d'éthyl(2E,4Z)-2-4-décadiènoate (ester de poire) et de (E,E)-8,10-dodécadièn-1-ol (codlemone). Nous avons placé deux séries de pièges appariés munis de l'un ou de l'autre appât dans sept vergers et les avons relevés tous les jours durant la période de vol du printemps en 2000 et 2001. L'incubation d'oeufs récoltés sur le terrain et l'inventaire des blessures sur les fruits ont servi à déterminer la date de la première éclosion. Les captures des papillons dans les pièges appâtés de codlemone et d'ester de poire commencent respectivement environ 144 et 105 degrés-jours avant le début de l'éclosion des oeufs. Nous avons ensuite vérifié dans 11 vergers de 2000 à 2002 l'efficacité de l'utilisation de la période de captures soutenues des papillons dans les pièges munis de ces appâts et relevés tous les 3-4 j comme point de référence biologique (Biofix) pour prédire le début de l'éclosion des oeufs. La date au calendrier du début des captures soutenues de papillons dans les pièges munis de ces appâts varie considérablement d'un verger à un autre et d'une année à l'autre. Il existe des différences significatives dans le nombre moyen cumulé de degrés-jours entre le début de la capture soutenue de papillons et l'éclosion des oeufs dans le cas des captures de mâles dans les pièges appâtés de codlemone et les cas des captures totales et des captures de femelles dans les pièges appâtés d'ester de poire. L'ajustement des Biofix d'après les seuils quotidiens de température change significativement le nombre de degrés-jours requis pour l'éclosion des oeufs seulement dans le cas des captures des papillons femelles. Il n'existe pas de différence significative dans la précision de la prédiction de la date de l'éclosion des oeufs par l'utilisation des appâts de codlemone ou d'ester de poire ou par l'ajustement de la date Biofix à l'aide des seuils de température. La variabilité la plus faible parmi les types de Biofix se retrouve dans le nombre cumulatif total de degrés-jours requis jusqu'à l'éclosion des oeufs par un Biofix (ajusté à un seuil de température relié à l'activité des papillons) déterminé d'après les captures des femelles dans un piège appâté d'ester de poire.

[Traduit par la Rédaction]

Type
Articles
Copyright
Copyright © Entomological Society of Canada 2005

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