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Biology and development of Acrolepiopsis assectella (Lepidoptera: Acrolepiidae) in eastern Ontario

  • P. G. Mason (a1), M. Appleby (a2), S. Juneja (a1), J. Allen (a2) and J.-F. Landry (a1)...

Abstract

Leek moth, Acrolepiopsis assectella, recently became established in the Ottawa Valley, where it significantly damages garlic, leek, and onion (Allium L., Liliaceae) crops. At a threshold of 7 °C, populations in eastern Ontario require 444.6 day-degrees to develop from egg to adult. Pheromone-trap data identify spring, early-summer, and late-summer flight periods of overwintered 1st- and 2nd-generation adults, respectively. Depending on ambient temperatures, the life cycle takes 3–6 weeks in the field, with three generations possible. Management strategies such as application of reduced-risk foliar insecticides and use of row covers require precise timing to target appropriate life-cycle stages. Implementation windows can be determined by incorporating pheromone-trap data and ambient air temperature into a life-cycle development model. A proposed integrated pest management program will involve the use of pesticides, mechanical barriers, and classical biological control.

La teigne du poireau, Acrolepiopsis assectella, s’est récemment établie dans la région de la vallée de l'Outaouais où elle cause d'importants dommages aux cultures d'aulx, de poireaux et d'oignons (Allium L., Liliaceae). À un seuil de 7 °C, les populations de l'est de l'Ontario requièrent 444,6 jours-degrés pour se développer de l'œuf à l'adulte. Les données provenant de pièges à phéromones indiquent des périodes de vol au printemps, en été et à la fin de l'été pour les adultes de la génération qui a hiverné, de la 1ère génération et de la 2e génération respectivement. Selon les températures ambiantes, le cycle biologique dure de 3–6 semaines en nature et il y a donc possibilité de trois générations. Les stratégies de gestion, telles que l'épandage d'insecticides foliaires à risque réduit et l'utilisation de bâches à plat sur les rangées, exigent un calendrier précis afin de cibler les stades appropriés du cycle biologique. Les fenêtres d'intervention peuvent être déterminées en incorporant les données provenant des pièges à phéromones et les températures ambiantes en un modèle de développement du cycle biologique. Un programme de lutte intégrée comporterait l'utilisation de pesticides, de barrières mécaniques et de lutte biologique classique.

[Traduit par la Rédaction]

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Corresponding author

1 Corresponding author (e-mail: peter.mason@agr.gc.ca).

References

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Biology and development of Acrolepiopsis assectella (Lepidoptera: Acrolepiidae) in eastern Ontario

  • P. G. Mason (a1), M. Appleby (a2), S. Juneja (a1), J. Allen (a2) and J.-F. Landry (a1)...

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