{"id":3224,"date":"2026-06-03T10:50:52","date_gmt":"2026-06-03T10:50:52","guid":{"rendered":"https:\/\/grimslovsskogstjanst.se\/?p=3224"},"modified":"2026-06-03T10:50:52","modified_gmt":"2026-06-03T10:50:52","slug":"spruce-bark-beetle-guide","status":"publish","type":"post","link":"https:\/\/grimslovsskogstjanst.se\/en\/spruce-bark-beetle-guide\/","title":{"rendered":"Spruce bark beetle: how to spot attacks and what to do"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Granbarkborre<\/strong> \u00e4r den insekt som orsakar st\u00f6rst ekonomiska skador i svensk granskog. Efter flera varma och torra somrar har angreppen \u00f6kat kraftigt i s\u00f6dra Sverige, och som skogs\u00e4gare i Kronoberg och Sm\u00e5land \u00e4r risken stor att du f\u00f6rr eller senare drabbas. Den goda nyheten \u00e4r att tidiga \u00e5tg\u00e4rder g\u00f6r enorm skillnad. Ju snabbare du uppt\u00e4cker ett angrepp, desto mer av virkesv\u00e4rdet kan du r\u00e4dda.<\/p>\n\n<p class=\"wp-block-paragraph\">I den h\u00e4r guiden g\u00e5r vi igenom hur du k\u00e4nner igen granbarkborre, n\u00e4r den sv\u00e4rmar, hur du agerar vid ett angrepp och hur du f\u00f6rebygger framtida skador. Vi tittar ocks\u00e5 p\u00e5 vad du g\u00f6r med marken n\u00e4r skadade granar har avverkats.<\/p>\n\n<h2 class=\"wp-block-heading\">Vad \u00e4r granbarkborre?<\/h2>\n\n<p class=\"wp-block-paragraph\">Granbarkborren (<em>Ips typographus<\/em>) \u00e4r en liten skalbagge p\u00e5 cirka 4 till 5 mm som lever i barken p\u00e5 gran. Honan borrar sig in genom barken och anl\u00e4gger g\u00e5ngar d\u00e4r \u00e4ggen l\u00e4ggs. N\u00e4r larverna kl\u00e4cks \u00e4ter de av innerbarken och stryper d\u00e4rmed tr\u00e4dets transport av vatten och n\u00e4ring. Ett kraftigt angripet tr\u00e4d d\u00f6r.<\/p>\n\n<p class=\"wp-block-paragraph\">Normalt angriper granbarkborren f\u00f6rsvagade, vindf\u00e4llda eller nyligen d\u00f6da granar. Men under utbrotts\u00e5r, n\u00e4r populationen \u00e4r stor, ger sig skalbaggarna \u00e4ven p\u00e5 fullt friska, st\u00e5ende tr\u00e4d. Det \u00e4r d\u00e5 de verkligt stora skadorna uppst\u00e5r.<\/p>\n\n<h2 class=\"wp-block-heading\">S\u00e5 k\u00e4nner du igen ett angrepp av granbarkborre<\/h2>\n\n<p class=\"wp-block-paragraph\">Att hitta angreppen tidigt \u00e4r helt avg\u00f6rande. Leta efter tecknen nedan fr\u00e5n maj och under hela sommaren, s\u00e4rskilt efter stormar och torrperioder.<\/p>\n\n<h3 class=\"wp-block-heading\">Tidiga tecken, h\u00e4r kan du fortfarande r\u00e4dda virke<\/h3>\n\n<ul class=\"wp-block-list\">\n<li><strong>Brunt borrmj\u00f6l.<\/strong> Det s\u00e4kraste tidiga tecknet. Finkornigt, brunt mj\u00f6l samlas i barksprickor, vid tr\u00e4dets bas, p\u00e5 r\u00f6tter och p\u00e5 spindelv\u00e4v intill stammen.<\/li>\n\n\n\n<li><strong>Ing\u00e5ngsh\u00e5l.<\/strong> Sm\u00e5 runda h\u00e5l, ungef\u00e4r 2 till 3 mm, j\u00e4mnt f\u00f6rdelade \u00f6ver barken.<\/li>\n\n\n\n<li><strong>K\u00e5dfl\u00f6de.<\/strong> Droppar och str\u00e4ngar av k\u00e5da d\u00e4r tr\u00e4det f\u00f6rs\u00f6ker f\u00f6rsvara sig mot intr\u00e4ngande skalbaggar.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Senare tecken, skadan \u00e4r ofta redan skedd<\/h3>\n\n<ul class=\"wp-block-list\">\n<li><strong>Hackspettsaktivitet.<\/strong> N\u00e4r barken flagas av syns ljusa fl\u00e4ckar p\u00e5 stammen. Spillkr\u00e5ka och andra hackspettar letar larver under barken.<\/li>\n\n\n\n<li><strong>Barken lossnar.<\/strong> Stora flagor faller av och blottar g\u00e5ngsystemen i innerbarken.<\/li>\n\n\n\n<li><strong>Kronan f\u00e4rgas.<\/strong> Barren gulnar och \u00f6verg\u00e5r i r\u00f6dbrunt innan de faller. N\u00e4r kronan v\u00e4l \u00e4r r\u00f6d har skalbaggarna oftast redan l\u00e4mnat tr\u00e4det och flyttat vidare till n\u00e4sta.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Just d\u00e4rf\u00f6r \u00e4r de gr\u00f6na, nyligen angripna tr\u00e4den med brunt borrmj\u00f6l viktigast att prioritera, inte de redan gr\u00e5 och d\u00f6da. Det \u00e4r ett vanligt och kostsamt misstag att l\u00e4gga kraften p\u00e5 fel tr\u00e4d.<\/p>\n\n<h2 class=\"wp-block-heading\">N\u00e4r sv\u00e4rmar granbarkborren?<\/h2>\n\n<p class=\"wp-block-paragraph\">Den f\u00f6rsta sv\u00e4rmningen sker p\u00e5 v\u00e5ren n\u00e4r temperaturen n\u00e5r omkring 18 \u00b0C, oftast under senare delen av april eller i maj i s\u00f6dra Sverige. Under varma somrar hinner granbarkborren med tv\u00e5, ibland tre, generationer, med en andra sv\u00e4rmning under sommaren. Det inneb\u00e4r att populationen kan m\u00e5ngdubblas p\u00e5 en enda s\u00e4song, och att \u00f6vervakningen beh\u00f6ver p\u00e5g\u00e5 hela v\u00e4gen in i augusti.<\/p>\n\n<h2 class=\"wp-block-heading\">S\u00e5 agerar du vid ett angrepp<\/h2>\n\n<ol class=\"wp-block-list\">\n<li><strong>Inventera regelbundet.<\/strong> G\u00e5 igenom dina granbest\u00e5nd flera g\u00e5nger under sommaren, med extra fokus p\u00e5 kanter mot hyggen, gl\u00e4ntor och omr\u00e5den som drabbats av storm eller torka.<\/li>\n\n\n\n<li><strong>S\u00f6k och plocka.<\/strong> Avverka och transportera bort de nyligen angripna tr\u00e4den innan n\u00e4sta generation flyger ut. D\u00e5 tar du med dig skalbaggarna ur skogen i st\u00e4llet f\u00f6r att l\u00e5ta dem f\u00f6r\u00f6ka sig.<\/li>\n\n\n\n<li><strong>F\u00e5 ut vindf\u00e4lld gran.<\/strong> Granar som brutits ned av storm och sn\u00f6 \u00e4r granbarkborrens favorityngelplats. Forsla bort dem f\u00f6re v\u00e5rsv\u00e4rmningen.<\/li>\n\n\n\n<li><strong>Lagra inte f\u00e4rskt virke i skogen.<\/strong> F\u00e4rska granstockar och granris (grot) \u00f6ver sommaren blir en yngelh\u00e4rd. K\u00f6r ut virket eller barka det.<\/li>\n\n\n\n<li><strong>Prioritera r\u00e4tt.<\/strong> L\u00e4gg kraften p\u00e5 f\u00e4rska angrepp med gr\u00f6n krona och brunt borrmj\u00f6l. Det \u00e4r d\u00e4r du faktiskt minskar n\u00e4sta generation.<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\">Skogsstyrelsen f\u00f6ljer utvecklingen noga och ger r\u00e5d om bek\u00e4mpning. \u00c4r du os\u00e4ker p\u00e5 om ett best\u00e5nd \u00e4r angripet, eller hur omfattande skadan \u00e4r, l\u00f6nar det sig n\u00e4stan alltid att ta in hj\u00e4lp tidigt. Tid \u00e4r pengar n\u00e4r det g\u00e4ller granbarkborre.<\/p>\n\n<h2 class=\"wp-block-heading\">F\u00f6rebygg framtida angrepp<\/h2>\n\n<p class=\"wp-block-paragraph\">En vital och v\u00e4lsk\u00f6tt skog st\u00e5r emot angrepp betydligt b\u00e4ttre \u00e4n ett t\u00e4tt, stressat best\u00e5nd. N\u00e5gra \u00e5tg\u00e4rder som minskar risken p\u00e5 sikt:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>H\u00e5ll skogen vital.<\/strong> Genom <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/services\/clearing\/\">r\u00f6jning<\/a> och gallring i r\u00e4tt tid f\u00e5r kvarvarande tr\u00e4d mer ljus, vatten och n\u00e4ring, och blir mer motst\u00e5ndskraftiga. L\u00e4s mer om <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/when-to-clear-the-forest-here-are-the-signals-not-to-be-missed\/\">n\u00e4r du b\u00f6r r\u00f6ja skogen<\/a>.<\/li>\n\n\n\n<li><strong>Variera tr\u00e4dslagen.<\/strong> Rena granbest\u00e5nd p\u00e5 torra, ol\u00e4mpliga marker \u00e4r extra utsatta. Genom att blanda in tall och l\u00f6v sprider du risken.<\/li>\n\n\n\n<li><strong>R\u00e4tt tr\u00e4d p\u00e5 r\u00e4tt mark.<\/strong> Plantera gran d\u00e4r den verkligen trivs. <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/the-right-plants-for-the-right-place-how-to-choose-planting-material-for-your-afforestation\/\">R\u00e4tt plantmaterial f\u00f6r st\u00e5ndorten<\/a> ger en stabilare skog.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Efter angreppet, \u00e5terbeskoga de drabbade ytorna<\/h2>\n\n<p class=\"wp-block-paragraph\">N\u00e4r angripna granar har avverkats st\u00e5r du med en yta som beh\u00f6ver \u00e5terbeskogas. D\u00e5 g\u00e4ller samma kedja som efter en vanlig slutavverkning: <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/services\/soil-preparation\/\">markberedning<\/a> f\u00f6r att ge de nya plantorna b\u00e4sta start, f\u00f6ljt av <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/services\/afforestation\/\">plantering<\/a>, g\u00e4rna med ett mer varierat tr\u00e4dslagsval f\u00f6r att minska s\u00e5rbarheten fram\u00e5t. Vi har samlat hela processen i v\u00e5r guide om <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/replanting-after-felling-step-by-step\/\">\u00e5terplantering efter avverkning steg f\u00f6r steg<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">F\u00f6r att skydda de nya plantorna mot vilt och snytbagge \u00e4r <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/services\/plant-treatment\/\">plantbehandling<\/a> ofta ett klokt n\u00e4sta steg.<\/p>\n\n<h2 class=\"wp-block-heading\">Vanliga fr\u00e5gor om granbarkborre<\/h2>\n\n<h3 class=\"wp-block-heading\">Hur vet jag om granen \u00e4r angripen?<\/h3>\n\n<p class=\"wp-block-paragraph\">Det tidigaste och s\u00e4kraste tecknet \u00e4r brunt borrmj\u00f6l i barksprickor och vid stammens bas. Leta \u00e4ven efter sm\u00e5 runda ing\u00e5ngsh\u00e5l och k\u00e5dfl\u00f6de. N\u00e4r kronan blir r\u00f6d \u00e4r angreppet oftast redan i ett sent skede.<\/p>\n\n<h3 class=\"wp-block-heading\">M\u00e5ste jag avverka angripna tr\u00e4d?<\/h3>\n\n<p class=\"wp-block-paragraph\">F\u00e4rska angrepp b\u00f6r tas ut snabbt och transporteras bort innan n\u00e4sta generation flyger ut, f\u00f6r att minska spridningen. Redan d\u00f6da, gr\u00e5 tr\u00e4d \u00e4r mindre br\u00e5dskande eftersom skalbaggarna d\u00e5 redan l\u00e4mnat dem.<\/p>\n\n<h3 class=\"wp-block-heading\">Kan jag f\u00f6rebygga granbarkborre?<\/h3>\n\n<p class=\"wp-block-paragraph\">Ja. H\u00e5ll skogen vital med r\u00f6jning och gallring i r\u00e4tt tid, f\u00e5 snabbt ut vindf\u00e4lld gran och f\u00e4rskt virke, variera tr\u00e4dslagen och plantera r\u00e4tt tr\u00e4d p\u00e5 r\u00e4tt mark.<\/p>\n\n<h2 class=\"wp-block-heading\">Beh\u00f6ver du hj\u00e4lp med granbarkborre?<\/h2>\n\n<p class=\"wp-block-paragraph\">Grimsl\u00f6vs Skogstj\u00e4nst hj\u00e4lper skogs\u00e4gare i s\u00f6dra Sverige med hela kedjan, fr\u00e5n att bed\u00f6ma och hantera angrepp till markberedning och \u00e5terplantering av drabbade ytor. <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/request-for-quotation\/\">Beg\u00e4r en kostnadsfri offert<\/a> eller <a href=\"https:\/\/grimslovsskogstjanst.se\/en\/contact\/\">kontakta oss<\/a> s\u00e5 ser vi \u00f6ver din skog tillsammans.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Granbarkborre \u00e4r den insekt som orsakar st\u00f6rst ekonomiska skador i svensk granskog. Efter flera varma och torra somrar har angreppen \u00f6kat kraftigt i s\u00f6dra Sverige, och som skogs\u00e4gare i Kronoberg och Sm\u00e5land \u00e4r risken stor att du f\u00f6rr eller senare drabbas. Den goda nyheten \u00e4r att tidiga \u00e5tg\u00e4rder g\u00f6r enorm skillnad. Ju snabbare du uppt\u00e4cker [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3035,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[18],"tags":[],"class_list":["post-3224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-skogsplantering"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spruce bark beetle: spot attacks and act right | Grimsl\u00f6vs Skogstj\u00e4nst<\/title>\n<meta name=\"description\" content=\"Learn to recognise the spruce bark beetle in time, act correctly during an attack and prevent damage. 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