{"id":133,"date":"2025-11-10T22:44:53","date_gmt":"2025-11-10T22:44:53","guid":{"rendered":"https:\/\/glasgrowtreesurgeons.com\/blog\/?p=133"},"modified":"2025-11-10T22:57:29","modified_gmt":"2025-11-10T22:57:29","slug":"common-tree-diseases-and-pests-in-the-uk-a-guide-by-glasgrow-tree-surgeons","status":"publish","type":"post","link":"https:\/\/glasgrowtreesurgeons.com\/blog\/2025\/11\/10\/common-tree-diseases-and-pests-in-the-uk-a-guide-by-glasgrow-tree-surgeons\/","title":{"rendered":"Common Tree Diseases and Pests in the UK \u2013 A Guide by GlasGrow Tree Surgeons"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\"><\/h1>\n\n\n\n<p>Healthy trees are vital to our gardens, streets, and local environment \u2014 but even the strongest trees can fall victim to disease or pest infestations. Across <strong>Glasgow and the west of Scotland<\/strong>, changing weather patterns, pollution, and imported species have all increased the risks to our trees. Knowing what to look for, and acting early, can make all the difference between saving a tree and losing it.<\/p>\n\n\n\n<p>At <strong>GlasGrow Tree Surgeons<\/strong>, we\u2019ve treated and removed hundreds of diseased trees across the region. Here\u2019s our guide to the <strong>most common UK tree diseases and pests<\/strong>, how to spot them, and what you can do to protect your trees.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Ash Dieback (Hymenoscyphus fraxineus)<\/h2>\n\n\n\n<p>One of the most destructive tree diseases in Europe, <strong>Ash Dieback<\/strong> affects ash trees across the UK.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dark lesions where branches meet the trunk<\/li>\n\n\n\n<li>Wilting leaves that turn black in summer<\/li>\n\n\n\n<li>Crown dieback (top of the tree thinning out)<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>Unfortunately, there\u2019s currently <strong>no cure<\/strong>. Early detection is key \u2014 infected trees may need to be removed to prevent the spread.<\/p>\n\n\n\n<p>GlasGrow\u2019s qualified arborists carry out <strong>risk assessments and controlled removals<\/strong>, ensuring all infected material is disposed of safely in accordance with Scottish environmental guidance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Dutch Elm Disease<\/h2>\n\n\n\n<p>Dutch Elm Disease has devastated the UK\u2019s elm population for decades, caused by a fungus spread by elm bark beetles.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Leaves turning yellow, curling, and falling prematurely<\/li>\n\n\n\n<li>Brown streaks under the bark<\/li>\n\n\n\n<li>Branch dieback starting from the crown downward<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>Infected elms should be <strong>removed and burned<\/strong>, as the disease spreads rapidly through root systems. If you suspect an infection, <strong>contact a professional tree surgeon<\/strong> immediately.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Honey Fungus (Armillaria)<\/h2>\n\n\n\n<p>Honey Fungus is a common cause of tree death in gardens across Glasgow. It attacks roots, slowly killing the host tree while spreading underground to others.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Golden mushrooms at the base of the trunk in autumn<\/li>\n\n\n\n<li>Cracked or bleeding bark<\/li>\n\n\n\n<li>White fungal sheets beneath the bark<\/li>\n\n\n\n<li>Sweet, mushroom-like smell from decaying wood<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>Once a tree is infected, <strong>removal is often the only option<\/strong>. It\u2019s essential to remove roots and infected soil to stop the fungus spreading. GlasGrow Tree Surgeons can excavate and safely dispose of infected material, helping protect surrounding trees.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Oak Processionary Moth (OPM)<\/h2>\n\n\n\n<p>The <strong>Oak Processionary Moth<\/strong> is an invasive pest that affects oak trees, now spreading northward in the UK. Its caterpillars can strip trees of leaves \u2014 and even cause allergic reactions in humans and pets.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bare patches or defoliation on oak trees<\/li>\n\n\n\n<li>White silk nests on trunks or branches<\/li>\n\n\n\n<li>Lines (\u201cprocessions\u201d) of moving caterpillars<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>OPM infestations require <strong>specialist removal<\/strong> due to health risks. Our trained operatives follow strict safety protocols for identification, containment, and disposal.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Phytophthora Root Rot<\/h2>\n\n\n\n<p>This disease affects a wide range of tree species \u2014 especially beech, oak, and conifers. It thrives in <strong>waterlogged soil<\/strong>, making it common in poorly drained areas around Glasgow.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Yellowing or thinning leaves<\/li>\n\n\n\n<li>Reduced growth<\/li>\n\n\n\n<li>Dark, oozing patches on the trunk<\/li>\n\n\n\n<li>Root decay and instability<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>Improving drainage can help reduce risk, but infected trees often require removal. GlasGrow\u2019s arborists can test soil, inspect roots, and advise on replacement planting with more resistant species.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Bleeding Canker of Horse Chestnut<\/h2>\n\n\n\n<p>Common in horse chestnut trees, this bacterial disease can cause severe damage if ignored.<\/p>\n\n\n\n<p><strong>Symptoms:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rust-coloured or dark patches on bark<\/li>\n\n\n\n<li>Oozing sap or \u201cbleeding\u201d from trunk<\/li>\n\n\n\n<li>Premature leaf drop and canopy thinning<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>There\u2019s no guaranteed cure, but <strong>early pruning<\/strong> and removal of infected material can prolong the tree\u2019s life. Regular inspections help spot early signs before structural damage occurs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. Aphids, Scale Insects &amp; Leaf Miners<\/h2>\n\n\n\n<p>While smaller than fungal or bacterial diseases, these pests weaken trees by feeding on sap and leaves.<\/p>\n\n\n\n<p><strong>Common signs include:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sticky residue (honeydew) on leaves or patios<\/li>\n\n\n\n<li>Curling or discoloured foliage<\/li>\n\n\n\n<li>Tiny holes or mines in leaves<\/li>\n<\/ul>\n\n\n\n<p><strong>Treatment:<\/strong><br>In mild cases, pruning infested branches can help. Severe infestations may need <strong>horticultural oil or systemic treatments<\/strong>, which should always be applied by a professional.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Preventing Tree Diseases and Pests<\/h2>\n\n\n\n<p>The best defence against disease is <strong>prevention<\/strong>. Regular tree inspections by a qualified arborist can identify early warning signs before damage becomes irreversible.<\/p>\n\n\n\n<p>At GlasGrow Tree Surgeons, we recommend:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Annual <strong>tree health checks<\/strong> (especially before winter)<\/li>\n\n\n\n<li>Regular pruning to improve airflow and reduce stress<\/li>\n\n\n\n<li>Avoiding waterlogging and compacted soil<\/li>\n\n\n\n<li>Removing deadwood and debris that harbour pests<\/li>\n\n\n\n<li>Replanting with <strong>native, disease-resistant species<\/strong><\/li>\n<\/ul>\n\n\n\n<p>We also provide detailed <strong>Tree Risk Assessments (TRA)<\/strong> for homeowners, schools, and commercial clients \u2014 ideal for insurance compliance and long-term safety.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why Choose GlasGrow Tree Surgeons?<\/h2>\n\n\n\n<p>Fully qualified and insured arborists (Lantra &amp; City &amp; Guilds certified)<br>Specialists in disease diagnosis and safe removal<br>Environmentally responsible \u2013 100% of green waste recycled<br>Local Glasgow experts familiar with native species and regional conditions<br>Free, no-obligation quotes and honest advice<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Protect Your Trees \u2014 Get a Health Check Today<\/h2>\n\n\n\n<p>If you\u2019ve spotted unusual growth, leaf loss, or fungal activity, don\u2019t wait until it\u2019s too late.<\/p>\n\n\n\n<p>Contact <strong><a href=\"https:\/\/www.glasgrowtreesurgeons.com\">GlasGrow Tree Surgeons<\/a><\/strong> for a <strong><a href=\"https:\/\/www.glasgrowtreesurgeons.com\/TreeInspection.php?utm_source=google&amp;utm_medium=ppc&amp;utm_campaign=sayhello&amp;utm_term=tree%20inspection%20services&amp;gad_source=1&amp;gad_campaignid=22479064730&amp;gbraid=0AAAAAqqTfOiBX2fMoT9FfIPE62jW9e859&amp;gclid=CjwKCAiAt8bIBhBpEiwAzH1w6Q2hZu6X7B1Pz8BmsCiIKFCTTUQjYjHZEYy6oltkqMUn3BBTXzyrBRoCsH8QAvD_BwE\" data-type=\"link\" data-id=\"https:\/\/www.glasgrowtreesurgeons.com\/TreeInspection.php?utm_source=google&amp;utm_medium=ppc&amp;utm_campaign=sayhello&amp;utm_term=tree%20inspection%20services&amp;gad_source=1&amp;gad_campaignid=22479064730&amp;gbraid=0AAAAAqqTfOiBX2fMoT9FfIPE62jW9e859&amp;gclid=CjwKCAiAt8bIBhBpEiwAzH1w6Q2hZu6X7B1Pz8BmsCiIKFCTTUQjYjHZEYy6oltkqMUn3BBTXzyrBRoCsH8QAvD_BwE\">professional tree health inspection<\/a><\/strong> anywhere in <strong>Glasgow and the surrounding areas<\/strong>.<\/p>\n\n\n\n<p>Call or message us today, or visit <strong><a>www.glasgrowtreesurgeons.com<\/a><\/strong> to book your free quote.<\/p>\n\n\n\n<p>We\u2019ll help you identify, treat, and prevent tree diseases \u2014 keeping Glasgow\u2019s greenery strong and healthy for years to come. <\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Healthy trees are vital to our gardens, streets, and local environment \u2014 but even the strongest trees can fall victim to disease or pest infestations. Across Glasgow and the west [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":136,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,53,18,52],"tags":[43,48,14,42,34,45,39,47,30,40,41,35,49,36,38,44,46,51,50,37],"class_list":["post-133","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ash-dieback","category-diseased-tree-removal","category-tree-diseasespests","category-tree-fungus","tag-aphids-on-trees","tag-arborist-advice","tag-ash-dieback","tag-bleeding-canker","tag-common-tree-diseases-uk","tag-diseased-tree-removal","tag-dutch-elm-disease","tag-glasgow-tree-surgeons","tag-glasgrow-tree-surgeons","tag-honey-fungus","tag-oak-processionary-moth","tag-phytophthora-root-rot","tag-professional-tree-care","tag-tree-diseases","tag-tree-diseases-glasgow","tag-tree-fungus","tag-tree-health-check","tag-tree-inspection-service","tag-tree-maintenance","tag-tree-pests"],"_links":{"self":[{"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/posts\/133","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/comments?post=133"}],"version-history":[{"count":1,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/posts\/133\/revisions"}],"predecessor-version":[{"id":134,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/posts\/133\/revisions\/134"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/media\/136"}],"wp:attachment":[{"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/media?parent=133"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/categories?post=133"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/glasgrowtreesurgeons.com\/blog\/wp-json\/wp\/v2\/tags?post=133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}