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Simulating the effectiveness of three potential management options to slow the spread of emerald ash borer (Agrilus planipennis) populations in localized outlier sites

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The emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), is a devastating, invasive insect pest of ash trees, Fraxinus spp., in North America. Using a simulation model, we evaluated three potential management options to slow the spread of A. planipennis in discrete outlier sites: (i) removing ash trees to reduce available host phloem resource, (ii) girdling ash trees to attract ovipositing female beetles and destroying the trees before larvae complete development, and (iii) applying a highly effective systemic insecticide. Simulations indicate that systemic insecticide applications provided the greatest reduction in the radial spread of A. planipennis. In simulations in which management options were applied only within a 300m radius from the origin of the infestation, insecticide applications reduced the radial spread by 30% and larval consumption of ash phloem by 40% beyond the treated area. In contrast, girdling ash trees reduced the radial spread by 15% and larval consumption of ash phloem by 20% beyond the treated area. Both of these management options significantly reduced the spread of A. planipennis when treatments were applied 1 to 4 years after infestations were initiated. Reducing ash phloem by removing ash trees decreased population size within treated areas but did not reduce the radial spread, population size, or larval consumption of ash phloem beyond treated areas.

L’agrile du frêne, Agrilus plenipennis Fairmaire (coléoptère, buprestidés), est un insecte nuisible envahissant qui est dévastateur pour le frêne, Fraxinus spp., en Amérique du Nord. À l’aide d’un modèle de simulation, nous avons évalué trois options potentielles de lutte pour ralentir la propagation d’A. plenipennis dans différents sites enclavés : (i) l’élimination des frênes pour réduire la ressource disponible que constitue le phloème de l’hôte, (ii) l’annélation des frênes pour attirer les insectes femelles durant la période d’oviposition et éliminer les arbres avant que les larves complètent leur développement et (iii) l’application d’un insecticide systémique très efficace. Les simulations indiquent que les applications d’insecticide systémique réduisent le plus la propagation radiale d’A. plenipennis. Dans les simulations où les options de lutte ont été appliquées seulement à l’intérieur d’un rayon de 300m du point d’origine de l’infestation, les applications d’insecticide ont réduit la propagation radiale de 30 % et l’alimentation dans le phloème du frêne par les larves de 40 % au-delà de la zone traitée. Par contre, l’annélation des tiges de frêne a réduit la propagation radiale de 15 % et l’alimentation dans le phloème du frêne par les larves de 20 % au-delà de la zone traitée. Ces deux options de lutte ont significativement réduit la propagation d’A. plenipennis lorsque les traitements étaient appliqués un à quatre ans après le début des infestations. L’élimination des frênes pour réduire la quantité de phloème disponible a diminué la taille de la population à l’intérieur des zones traitées mais n’a pas réduit la propagation radiale, la taille de la population, ni l’alimentation dans le phloème du frêne au-delà des zones traitées.

Document Type: Research Article

Publication date: February 1, 2011

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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