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Damage reduction and performance of mass trapping devices for forest protection against the spruce bark beetle, Ips typographus (Coleoptera Curculionidae Scolytinae)
Réduction des dégâts et efficacité des dispositifs de piégeage de masse pour la protection des forêts contre le typographe, Ips typographus (Coleoptera Curculionidae Scolytinae)
Annals of Forest Science volume 65, page 309 (2008)
Abstract
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• The spruce bark beetle, Ips typographus, is one of the main European forest pests, and mass trapping is probably the most common strategy applied to reduce its population density. However, the results concerning the effectiveness of this control system are often controversal, and many studies consider only the trapping performance with no attention to the damage reduction.
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• During spring-summer 2005, a control program against I. typographus outbreaks was set up in NE Italy. Twenty-four spruce forests heavily infested by I. typographus were studied: six protected by pheromone slot-traps, six by horizontal trap-logs and six by standing trap-logs; six untreated stands were kept as controls. Trap-logs were baited with a pheromone specific to I. typographus and treated with insecticide. Each type of device was tested at high, medium and low density in relation to the number of trees infested during the previous year. New damage occurring in the investigated stands was later monitored for one year.
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• Protected forests showed mean damage about 80% lower in 2005 than in 2004, with no statistical difference among traps, trap-logs or standing trap-logs. Instead, unprotected forests (controls) suffered damage to a similar extent in both years. Trapping devices showed no statistical differences among mean captures. Device densities showed similar results in damage reduction and insect trapping.
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• The results support the hypothesis that intensive trapping performed at stand level may be useful for protecting forests against I. typographus, locally reducing population density and tree mortality.
Résumé
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• Le coléoptère scolytide, Ips typographus, est l’un des principaux ravageurs des forêts européennes d’épicéa, et le piégeage phéromonal est probablement le procédé de lutte le plus utilisé pour réduire la densité de ses populations. Cependant, l’efficacité de ce système de contrôle n’est souvent pas très claire, et beaucoup d’études considèrent seulement les performances du piégeage et non la réduction des dégâts.
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• En 2005, un programme de lutte contre I. typographus a été appliqué dans le Nord-Ouest de l’Italie. Une étude a été conduite dans 24 forêts d’épicéa lourdement infestées par le typographe : six protégées par pièges à phéromones, six par arbres-pièges abattus, six par arbres-pièges sur pied, et six laissées sans protection (témoins). Les arbres-pièges ont été appâtés avec une phéromone spécifique d’ I. typographus et traités avec un insecticide. Chaque type de dispositif a été testé à haute, moyenne et basse densité en se basant sur le nombre d’arbres infestés l’année précédente. Les dégâts nouveaux causés par le typographe ont été suivis pendant un an.
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• En 2005, toutes les forêts protégées ont montré un niveau moyen de dégâts d’environ 80 % inférieur à celui de 2004, sans différence significative entre les dispositifs, alors que les forêts témoins ont souffert de dégâts similaires les deux années. Le nombre moyen de captures ne différait pas significativement entre les dispositifs de piégeage. La diminution des dégâts et du nombre d’insectes piégés a été comparable à toutes les densités de traitement.
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• Ces résultats confortent l’hypothèse selon laquelle le piégeage de masse au niveau du peuplement peut être utile pour la protection des forêts contre le typographe, en diminuant la densité de population du ravageur et ses dégâts.
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Faccoli, M., Stergulc, F. Damage reduction and performance of mass trapping devices for forest protection against the spruce bark beetle, Ips typographus (Coleoptera Curculionidae Scolytinae). Ann. For. Sci. 65, 309 (2008). https://0-doi-org.brum.beds.ac.uk/10.1051/forest:2008010
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DOI: https://0-doi-org.brum.beds.ac.uk/10.1051/forest:2008010