{"id":25095041,"date":"2026-05-30T14:21:14","date_gmt":"2026-05-30T12:21:14","guid":{"rendered":"https:\/\/frelons.be\/2026\/05\/30\/frelon-asiatique-a-grimbergen-guide-didentification-et-intervention\/"},"modified":"2026-05-30T14:21:14","modified_gmt":"2026-05-30T12:21:14","slug":"asian-hornet-in-grimbergen-guide-to-identification-and-intervention","status":"publish","type":"post","link":"https:\/\/frelons.be\/en\/2026\/05\/30\/frelon-asiatique-a-grimbergen-guide-didentification-et-intervention\/","title":{"rendered":"Asian hornet in Grimbergen: Identification and intervention guide"},"content":{"rendered":"<h1>Hornet invasion in Grimbergen: Reporting and destruction<\/h1>\n<h3 id=\"sommaire\">Contents<\/h3>\n<ul>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#reconnaitre-le-frelon-asiatique-et-ses-nids-dans-la-commune-de-grimbergen\">Recognizing the Asian hornet and its nests in Grimbergen<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#guide-pratique-pour-signaler-un-nid-de-frelons-a-grimbergen-en-toute-securite\">A practical guide to safely reporting a hornet's nest in Grimbergen<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#fonctionnement-d-une-intervention-professionnelle-de-destruction-de-nids\">How professional nest destruction works<\/a><\/p>\n<\/li>\n<li>\n<p><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" class=\"text-primary underline toc-link\" href=\"#conclusion\">Conclusion<\/a><\/p>\n<\/li>\n<\/ul>\n<p>Last summer, a beekeeper in Strombeek-Bever lost three hives in less than two weeks. The culprit: a nest of Asian hornets in an oak tree, fifteen meters high and barely visible from the ground. When he contacted us, the nest was already the size of a basketball. This kind of situation is becoming increasingly common in Grimbergen and neighbouring towns.<\/p>\n<h3 id=\"ce-qu-il-faut-retenir\">Things to remember<\/h3>\n<ul>\n<li>\n<p>This article combines the story of an ultra-local intervention in Grimbergen with a practical guide.<\/p>\n<\/li>\n<li>\n<p>The idea is to reassure residents by demonstrating concrete expertise on their territory (1850) while providing the key steps for reporting and safe destruction.<\/p>\n<\/li>\n<li>\n<p>Recognizing the Asian hornet and its nests in Grimbergen<\/p>\n<\/li>\n<li>\n<p>A practical guide to safely reporting a hornet's nest in Grimbergen<\/p>\n<\/li>\n<\/ul>\n<p>The Asian hornet, or <em>Vespa velutina<\/em>, is no longer an exotic curiosity in Belgium. It settles in, it reproduces, and it causes real damage: to bee colonies, to local biodiversity, and sometimes to the inhabitants themselves. If you live in 1850 Grimbergen and suspect the presence of a nest, this article is for you. Together we'll look at how to recognize the insect, how to report its presence correctly, and what actually happens when you intervene to destroy a nest.<\/p>\n<h2 id=\"reconnaitre-le-frelon-asiatique-et-ses-nids-dans-la-commune-de-grimbergen\">Recognizing the Asian hornet and its nests in Grimbergen<\/h2>\n<p>First thing: don't confuse the Asian hornet with the European hornet. This is the most frequent error encountered in the field. The European hornet is bigger, redder and, frankly, less aggressive towards bees. The <em>Vespa velutina<\/em>, is darker. Its thorax is almost entirely black, its legs have conspicuous yellow tips, and its face is orange. It's also a little smaller than its European cousin, which often surprises people. You'd expect a monster, and what you get is an insect of about 3 centimetres.<\/p>\n<p>So, is the Asian hornet the most dangerous hornet in the world? No. Its sting is painful, comparable to that of a wasp, but no more venomous per se. The real danger is the possible allergic reaction and, above all, the defensive behavior of the nest. A lone hornet won't attack you for no reason. Approach an active nest, and it's a different story: dozens of individuals can emerge in a matter of seconds.<\/p>\n<p><img decoding=\"async\" class=\"max-w-full h-auto rounded-md\" src=\"https:\/\/nghaeknymynesecnqcmd.supabase.co\/storage\/v1\/object\/public\/article-images\/article-1780126525143-frelon-asiatique-a-grimbergen-guide-d-identification-et-intervention.png\" alt=\"Asian hornet in Grimbergen: Identification and intervention guide\"><\/p>\n<p>To identify an Asian hornet nest in Grimbergen, you need to know that there are two types, depending on the season. In spring, the founding queen builds a primary nest, often small (the size of a tennis ball), in a sheltered spot: under an awning, in a garden shed, sometimes even in a low hedge. This nest is discreet and easy to miss. Yet this is the best time to act, because the colony is still tiny.<\/p>\n<p>From summer onwards, the colony often moves to a secondary nest. You can't miss this one when it's visible: it can be 80 centimetres in diameter or more. It's usually found high up in the treetops, but can also be found under a roof or in an attic. In Grimbergen, with its many tree-lined gardens and wooded areas along the canal, there's no shortage of locations. Nests have already been treated in century-old lime trees in the town center, as well as in agricultural sheds near Humbeek.<\/p>\n<p>How can you tell the difference with a wasp nest? The Asian hornet's nest has a side opening, not below. Its texture is similar (papier-m\u00e2ch\u00e9), but its shape is rounder, almost spherical for larger nests. And the comings and goings of hornets are characteristic: they fly slower and more directly than wasps, often in a straight line towards the nest.<\/p>\n<p>If you see a dark insect with yellow legs hovering in front of your beehives or circling ripe fruit in your Grimbergen garden, take a photo. It's the first thing you should do. A good photo allows you to confirm identification without taking unnecessary risks.<\/p>\n<h2 id=\"guide-pratique-pour-signaler-un-nid-de-frelons-a-grimbergen-en-toute-securite\">A practical guide to safely reporting a hornet's nest in Grimbergen<\/h2>\n<p>You've spotted a suspicious nest in your garden or in a nearby tree. The temptation is there to take care of it yourself, especially if you have a garden hose or a can of insecticide at hand. Just don't do it. I mean it. We've seen people end up in emergency rooms after trying to unhook a nest with a ladder. An active nest of <em>Vespa velutina<\/em> may contain several hundred individuals, and their reaction is immediate and coordinated.<\/p>\n<p>Reporting an Asian hornet in Belgium is fairly straightforward. The official platform is <strong>vespawatch.be<\/strong>. You submit your observation with a photo, precise location and description. Surveillance network experts validate the identification, often in less than 24 hours. This is the channel recommended by federal and regional authorities.<\/p>\n<p>At local level, the Grimbergen commune is aware of the problem. You can contact the local administration to report a nest on public land, in a park or along a path. For a nest on your private property, it's up to you to call in a professional, but the commune can sometimes direct you to the right contacts or inform you of any aid available. Some communes in Flanders co-finance the destruction of nests. Contact the Grimbergen town hall for details.<\/p>\n<p>A few basic safety rules while waiting for the intervention:<\/p>\n<ul>\n<li>\n<p>Keep your distance from the nest. At least five meters, ideally more. No sudden movements in the vicinity.<\/p>\n<\/li>\n<li>\n<p>Warn your neighbors, especially if they have children or pets playing in the garden.<\/p>\n<\/li>\n<li>\n<p>Never try to block the nest entrance, water it or burn it. Each of these \u00absolutions\u00bb provokes a massive attack.<\/p>\n<\/li>\n<li>\n<p>If the nest is close to a busy passageway (sidewalk, school entrance), report it to the local police so that a perimeter can be set up.<\/p>\n<\/li>\n<\/ul>\n<p>An important point: we're sometimes asked why we shouldn't kill individual hornets we come across. The answer is nuanced. A hornet isolated far from a nest does not represent an immediate danger. Killing it is pointless if you can't locate the nest, because the problem is the colony, not the individual. And in spring, if you kill a founding queen before she's built her nest, it's effective. The rest of the time, concentrate your efforts on reporting the nest rather than hunting individuals.<\/p>\n<p>For beekeepers in Grimbergen and Strombeek-Bever, reporting is all the more urgent as the Asian hornet is a formidable predator of bees. A single colony of <em>Vespa velutina<\/em> can decimate an entire apiary in a matter of weeks. If you notice hornets parking in front of your hives (known as \u00abhawking\u00bb), there's probably a nest within a 500-meter radius. Report it immediately.<\/p>\n<h2 id=\"fonctionnement-d-une-intervention-professionnelle-de-destruction-de-nids\">How professional nest destruction works<\/h2>\n<p>We often get the same question: how much does it cost and how does it work? Here's a step-by-step guide to destroying a hornet's nest in Grimbergen.<\/p>\n<p>It all starts with a diagnosis. We visit the site to confirm the presence of Asian hornets and assess the situation: nest height, accessibility, proximity to dwellings, estimated size of the colony. This diagnosis determines the method of intervention and the equipment required.<\/p>\n<p>For accessible nests (below 10-12 meters), the procedure is relatively standard. The operator, wearing a full-body anti-sting suit, injects a biocidal product directly into the nest using a telescopic pole. The product acts within a few minutes on the individuals present. The nest is then physically removed whenever possible, to prevent recolonization and to ensure that birds do not become poisoned by eating treated larvae.<\/p>\n<p>For high nests, above 15 meters in a tree, it's more technical. Sometimes a gondola is used, sometimes rope-climbing techniques. In some cases, when access is really complicated, we can treat from a distance using a long pole or a pressure injection system. Every case is different. A nest in a fir tree 20 metres away in a garden in Strombeek-Bever is not the same as a nest under a cornice three metres above ground.<\/p>\n<p>The price of a hornet pest control service varies according to these parameters. For a standard intervention on an accessible nest, you should generally expect to pay between 100 and 150 euros. Elevated operations using a cherry picker or climbing ladder can cost 200-300 euros, sometimes more if the logistics are complex. These rates include travel, treatment and removal of the nest. At Frelons.be, we announce the price before we intervene, so there are no surprises at the end.<\/p>\n<p>Another question that comes up regularly is: is the intervention guaranteed? Yes. If the nest becomes active again after treatment (which happens very rarely, less than 2% of the time), we come back free of charge. The product used has a residual effect which also eliminates hornets which were in flight at the time of treatment and which return to the nest in the following hours.<\/p>\n<p>When to intervene? As early as possible. A nest treated in spring, when it contains just one queen and a few workers, is a matter of ten minutes. A nest in September, with 500 individuals and future queens ready to swarm, is a heavier and riskier intervention. We intervene all year round, but the ideal window is between May and July, before the colony reaches its maximum size.<\/p>\n<p>At Frelons.be, we cover the whole of Grimbergen, including Strombeek-Bever, Humbeek and Beigem. We know the commune and its special features (large gardens, areas close to the abbey, recent housing estates with young hedges where queens like to settle in spring). This local knowledge saves time, and time counts when it comes to hornets.<\/p>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>The Asian hornet has settled in Grimbergen. It's neither a rumor nor a projection: reports are multiplying every year in and around 1850. The good news is that the problem is manageable if you react quickly. Identify the insect correctly, report the nest via official channels or directly to a professional, and don't take any risks yourself.<\/p>\n<p>If you've spotted a nest, or if you see suspicious hornets in your garden, contact Frelons.be. We intervene quickly in Grimbergen and the surrounding area, with a clear rate announced in advance. A nest treated early means a problem solved before it becomes serious.<\/p>\n<h2 id=\"questions-frequentes\">Frequently asked questions<\/h2>\n<details class=\"faq-item\">\n<summary>How to recognize an Asian hornet from a European hornet in Grimbergen?<\/summary>\n<p>The Asian hornet is darker and slightly smaller (around 3 cm) than the European hornet. It can be distinguished by its almost entirely black thorax, orange face and characteristic yellow-tipped legs.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>What should I do if I find a hornet's nest in Grimbergen?<\/summary>\n<p>Never attempt to destroy the nest yourself, as Asian hornets attack in a massive, coordinated fashion when threatened. Take a photo from a safe distance, then report it on the official VespaWatch.be platform, or contact a professional like Frelons.be for a safe intervention.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>How much does it cost to destroy a hornet's nest in Grimbergen?<\/summary>\n<p>The cost of a standard insect removal operation for an easily accessible nest generally varies between \u20ac100 and \u20ac150. For complex operations at great heights (over 15 meters) requiring a gondola or climbing equipment, the price can vary between \u20ac200 and \u20ac300.<\/p>\n<\/details>\n<details class=\"faq-item\">\n<summary>When should you intervene to eliminate an Asian hornet nest?<\/summary>\n<p>It is advisable to intervene as early as possible, ideally between May and July, when the nest is still small. Treating the colony before the end of summer makes it easier to take action and prevents future queens from flying off to found new nests in the commune (1850).<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>Hornet invasion in Grimbergen: Reporting and destructionSummaryAsian hornets and their nests in GrimbergenHow to report a hornet nest in Grimbergen...<\/p>","protected":false},"author":2,"featured_media":25095040,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-25095041","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe"],"_links":{"self":[{"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/posts\/25095041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/comments?post=25095041"}],"version-history":[{"count":0,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/posts\/25095041\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/media\/25095040"}],"wp:attachment":[{"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/media?parent=25095041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/categories?post=25095041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/frelons.be\/en\/wp-json\/wp\/v2\/tags?post=25095041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}