{"id":110640,"date":"2025-11-04T02:32:00","date_gmt":"2025-11-04T01:32:00","guid":{"rendered":"https:\/\/www.sonnenseite.com\/?p=110640"},"modified":"2025-11-03T14:32:49","modified_gmt":"2025-11-03T13:32:49","slug":"tree-mortality-from-insects-is-rising-across-europe","status":"publish","type":"post","link":"https:\/\/www.sonnenseite.com\/en\/environment\/tree-mortality-from-insects-is-rising-across-europe\/","title":{"rendered":"Tree mortality from insects is rising across Europe"},"content":{"rendered":"\n<p>Insect-driven tree mortality is rising across Europe, finds an international study led by the Czech University of Life Sciences with participation of WSL. Conifers are hit harder, broadleaf damage declines. Warm, dry regions are most affected. The results, published in <em>Global Change Biology,<\/em> can help forest management by informing species choice and climate adaptation.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li>Bark- and wood-borer impacts on conifers <strong>increased substantially<\/strong> in the 21st century, while defoliation by moths decreased across Europe.<\/li>\n\n\n\n<li>Disturbance of conifers is driven largely by the <strong>spruce bark beetle<\/strong>; in contrast, broadleaved trees are impacted by several species, potentially complicating monitoring and control.<\/li>\n\n\n\n<li>Species once considered resilient \u2013 such as pine and fir \u2013 show increasing insect damage, raising concerns about their future suitability.<\/li>\n\n\n\n<li>Disturbance levels are consistently higher in <strong>warmer and drier<\/strong> parts of Europe, signalling elevated future risk under continued warming.<\/li>\n\n\n\n<li>Populations of insects that share hosts or feeding strategies tend to rise and fall together, increasing the likelihood of <strong>continent-scale pulses<\/strong> of tree mortality.<\/li>\n\n\n\n<li>There is <strong>no simple north\u2013south gradient.<\/strong> Regional climate variability and extreme events often outweigh latitudinal effects in insect disturbance patterns.<\/li>\n\n\n\n<li><strong>Damage from tree pathogens and non-native invasive species<\/strong> was not addressed, but also warrants more attention as seen in the case of ash dieback, for example.<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<p>Tree-feeding insects are affecting Europe\u2019s forests increasingly but in uneven ways, according to an international study published in <em>Global Change Biology<\/em>. The <strong>international team from 17 European countries, including WSL for Switzerland,<\/strong> reports that <strong>wood-boring insects <\/strong>are causing increasing damage to multiple conifer species, while <strong>defoliation caused by caterpillars <\/strong>of different moth species has been declining in recent years. Across temperate and boreal Europe, insect disturbance is consistently higher<strong> in warmer and drier regions<\/strong>, indicating the risk of large, sudden impacts as climate extremes intensify.<\/p>\n\n\n\n<p>\u201cOur results show a clear signal: conifer-dominated forests are increasingly vulnerable to wood- and bark-boring insects, in particular the spruce bark beetle, while broadleaved tree species are experiencing decreasing levels of damage from a more diverse group of insects,\u201d said Tom\u00e1\u0161 Hl\u00e1sny, the study\u2019s lead author from the Czech University of Life Sciences Prague. \u201cThese findings are important, <strong>providing guidance for forest management<\/strong>, tree species choice, climate change adaptation, and planning of future timber markets\u201d.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Why it matters <a href=\"https:\/\/www.wsl.ch\/en\/news\/tree-mortality-from-insects-is-rising-across-europe\/#c1057360\"><\/a><\/h4>\n\n\n\n<p>The findings support policies that shift forest management toward more<strong> climate-resilient tree species <\/strong>compositions, with the dominance of broadleaved species, alongside <strong>stronger, interoperable monitoring of forest disturbance <\/strong>and data sharing across countries. \u201cWe need adaptation strategies that reflect diverging disturbance trends and uneven exposure levels across Europe\u2019s forests,\u201d Hl\u00e1sny said. \u201cThis requires effort in coordinated forest risk monitoring, harmonized data collection and sharing, and guidance that can be acted upon by managers and inform markets.\u201d<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">How the study was conducted <a href=\"https:\/\/www.wsl.ch\/en\/news\/tree-mortality-from-insects-is-rising-across-europe\/#c1057361\"><\/a><\/h4>\n\n\n\n<p>Researchers compiled annual disturbance records from 15 European countries for more than two decades (2000\u20132022), including data from Swiss Forest Protection and the <a href=\"https:\/\/www.lfi.ch\/en\" target=\"_blank\" rel=\"noreferrer noopener\">Swiss National Forest Inventory<\/a>, which is led by the WSL. The dataset represents 1,361 time series for 50 insect species. The team analysed trends by feeding guild (borers vs. defoliators), host tree species group (conifers vs. broadleaves), and geographic\/climatic gradients. The work also introduced a novel harmonized disturbance dataset designed to complement existing monitoring and support future research.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hl\u00e1sny T., Modlinger R., Gohli J., Seidl R., Krokene P., Bernardinelli I., \u2026 Liebhold A.M. (2025) Divergent trends in insect disturbance across Europe\u2019s temperate and boreal Forests. Glob. Chang. Biol. 31(11), e70580 (19 pp.).\u00a0<a href=\"https:\/\/doi.org\/10.1111\/gcb.70580\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1111\/gcb.70580<\/a><\/li>\n<\/ul>\n\n\n<h5 class=\"green\">Source<\/h5>\r\n\n\n\n<p><a href=\"https:\/\/www.wsl.ch\/en\/news\/tree-mortality-from-insects-is-rising-across-europe\/\">WSL 2025<\/a><\/p>\n<div class=\"shariff shariff-align-flex-start shariff-widget-align-flex-start\"><div class=\"ShariffHeadline\">Diese Meldung teilen<\/div><ul class=\"shariff-buttons theme-round orientation-horizontal buttonsize-medium\"><li class=\"shariff-button facebook shariff-nocustomcolor\" style=\"background-color:#4273c8;border-radius:1%\"><a href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fwww.sonnenseite.com%2Fen%2Fenvironment%2Ftree-mortality-from-insects-is-rising-across-europe%2F\" title=\"Bei Facebook teilen\" aria-label=\"Bei Facebook teilen\" role=\"button\" rel=\"nofollow\" class=\"shariff-link\" 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