1,720,965 research outputs found
Massive windfalls boost an ongoing spruce bark beetle outbreak in the Southern Alps
Full text linkEuropean coniferous forests are currently threatened by bark beetles (e.g. Ips typographus) because of an increasing incidence of triggering factors, such as drought and windstorms. Furthermore, such natural disturbances are expected to increase in terms of magnitude and frequency due to climate change, and thus interacting with each other. Here, we present a particular case study in the Southern Italian Alps (Gares, Canale d’Agordo, Belluno), in which wind disturbance interacts with an ongoing outbreak of I. typographus, probably associated with an extended drought in the previous three years. By combining remote sensing and field surveys, we spatially reconstructed the bark beetle attack in the period 2015-2021, which includes the Vaia windstorm in October 2018. Although the windstorm occurred in an expanding phase of the bark beetle outbreak, attacks on standing trees did not occur during the first year after the windstorm but were observed two years later. Our findings suggest that an overlap of a large availability of wind felled trees with an incipient outbreak of I. typographus resulted in an immediate decrease of standing trees mortality in the year following the storm. However, the fallen trees worked as a hidden sink for the beetle population, which in the following years massively attacked the standing trees that survived the storm
Effectiveness of different trapping protocols for outbreak management of the engraver pine beetle Ips acuminatus (Curculionidae, Scolytinae)
No full textA population of Ips acuminatus was monitored from 2007 to 2009 by multi-funnel pheromone-baited traps in a Scots pine forest of the southeastern Alps of Europe. We compared the captures obtained with two different lures (Austrian and Spanish pheromones, commercially available) in five infested types of forest. Although captures showed a similar trend among sites, with no significant interaction between lures and sites, the Spanish pheromone was on average eight times more attractive than the Austrian one. The mean number of trapped insects was lower in healthy stands (control) and old clearcuts (more than 1 year old) than in sites suffering recent infestation (standing or felled infested trees and recent clearcuts). Total captures were significantly correlated with tree mortality recorded annually within a 500 m radius around the traps. This pattern may be a useful input for establishing the timing of application of the best monitoring program of I. acuminatus populations. © 2012 Copyright Taylor and Francis Group, LLC
Sanitation felling and helicopter harvesting of bark beetle-infested trees in alpine forests: An assessment of the economic costs
No full textBetter today but worse tomorrow: how warm summers affect breeding performance of a Scots pine pest.
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Il bostrico tipografo sulle Alpi orientali. Evoluzione, gestione e prospettive future dopo Vaia
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