Honey bee diseases and pests in the UK

Honey Bee Diseases and Pests in the UK – Overview for Beekeepers

Last updated: 1 May 2026

Honey bee diseases and pests are an unavoidable part of beekeeping, but with regular inspections, good hive hygiene and clear guidance they can be managed. This page provides an overview of the main disease and pest groups that affect colonies in the UK and explains how they link to day-to-day management, seasonal decision-making and the wider year in the apiary.

New beekeepers are often worried about getting everything wrong or missing early signs of trouble. The aim here is not to make you anxious, but to show that honey bee health is something you can monitor and improve over time, especially when you work alongside your local association, inspectors and official resources such as BeeBase. If you are not sure what problem you are looking at, try the interactive colony health triage tool to work through symptoms step by step, or use the bee health checker if you prefer a quicker symptom-based route. If the signs do not obviously fit foulbrood, varroa or a classic pest problem, the other conditions page is a useful next stop.

Bee health also changes through the season. Spring inspections often focus on brood health, colony build-up and early warning signs, while late summer and early autumn are key periods for varroa control and winter preparation. For the bigger seasonal picture, see the year in the apiary, especially spring disease checks in April, May colony checks, late-summer varroa planning in August and September follow-up checks.

Common Bee Health Symptoms and Colony Problems

If you are looking for a specific symptom rather than a named disease, start here. These guides help you work from what you can see at the hive towards the most likely causes.

Main Categories of Honey Bee Diseases and Pests

Most honey bee health problems in the UK fall into a few broad groups. Understanding those groups makes it easier to narrow down likely causes when something does not look right in the hive.

Bacterial diseases include American foulbrood (AFB) and European foulbrood (EFB). These diseases affect developing brood and are taken very seriously in the UK because they are notifiable. Suspicious brood patterns, discoloured larvae, sunken cappings and unusual smells should never be ignored. The bacterial diseases guide explains the warning signs and links to the dedicated AFB and EFB pages.

Viral diseases are often closely connected with varroa mite pressure. Problems such as deformed wing virus may become visible when mite levels have been allowed to build too high. These conditions are explored in more detail within the viral diseases section.

Parasitic mites, especially varroa destructor, remain one of the most significant long-term threats to honey bee health in the UK. Varroa weakens bees directly and also spreads viruses throughout the colony. Monitoring and seasonal treatment planning are covered in the varroa management guide and the parasitic mites overview.

Pests and predators include wax moth, wasps, mice and emerging threats such as the small hive beetle and Asian hornet. Some pests damage comb and stored equipment, while others weaken colonies directly or increase stress during difficult periods. These are covered throughout the bee pests section.

Other conditions include problems that do not always fit neatly into one category, such as chilled brood, starvation, queen failure, nutritional stress and colony collapse patterns. These situations are explored further in the other conditions section, which is especially useful when symptoms overlap or do not clearly point to a single disease.

Brood Disease and Diagnosis Guides

Brood problems are one of the most important areas of hive inspection because developing brood often provides the clearest warning signs that something is wrong inside the colony.

If you are seeing patchy brood, abnormal larvae, sunken cappings, perforated cappings, mummified brood or unhealthy-looking sealed brood, compare what you are seeing with the dedicated disease pages before moving frames or equipment between colonies.

The American foulbrood and European foulbrood pages explain the key signs of the two major notifiable bacterial diseases in the UK, while chalkbrood, sacbrood and chilled brood cover common disease-like brood conditions that may appear during periods of stress, weakness or poor weather.

If the issue appears connected to varroa or virus pressure, compare symptoms with the deformed wing virus guide and the wider brood problems guide. If you are unsure whether something could be foulbrood, use the foulbrood vs chalkbrood comparison and follow the guidance on when to contact a bee inspector.

Recognising When Something Is Wrong

The first step in protecting your bees is learning what a healthy colony normally looks like. Once you become familiar with healthy brood, normal colony strength and seasonal behaviour, unusual signs become much easier to recognise.

If something appears wrong but you cannot yet identify the cause, use the colony health triage tool or the bee health checker to narrow down likely explanations before moving into the more detailed disease pages.

Healthy brood patterns are usually compact and even, with relatively few empty cells scattered across the brood area. Patchy brood, discoloured larvae, sunken cappings or unpleasant smells should always prompt a closer inspection. Comparing colonies within the same apiary can also help because one noticeably weak hive among several strong colonies may indicate an underlying problem.

Behaviour matters as well. Bees that are unusually aggressive, lethargic, crawling, trembling or disorientated may be showing signs of stress, disease, queen problems or poisoning. Looking at the overall pattern rather than focusing on a single symptom often gives a clearer picture.

Your local beekeeping association, mentors and inspectors are valuable sources of support. Looking at brood frames with experienced beekeepers helps build confidence far more quickly than trying to diagnose everything alone. It also helps to compare what you are seeing against the seasonal expectations outlined in the year in the apiary, especially during spring build-up and late-summer varroa periods.

Hive Hygiene – Simple Habits That Reduce Risk

Good hive hygiene is one of the simplest and most effective ways to reduce disease pressure in an apiary. Many of the best habits are low-cost and straightforward, but they rely on consistency throughout the beekeeping season.

Keeping tools and equipment clean helps reduce the spread of disease between colonies. Hive tools, gloves and hive parts should be cleaned regularly, especially when inspecting colonies that appear weak or suspicious. If you are concerned about a colony, avoid moving frames or equipment into other hives until you are confident the problem has been identified safely.

Comb management also matters. Very old, damaged or dark comb can gradually accumulate disease pressure and residues over time, so replacing comb regularly is considered good practice. Drawn comb should also be stored carefully when not in use to reduce the risk of wax moth damage.

Robbing behaviour increases disease risk because bees may carry infected honey or contaminated material between colonies. Reducing entrances on weak colonies, avoiding exposed honey around the apiary and managing late-season feeding carefully can all help reduce robbing pressure.

The dedicated hive hygiene guide explains these practices in more detail, including cleaning methods, comb replacement planning and seasonal hygiene routines that support healthier colonies over time.

Working with Official UK Guidance and BeeBase

In the UK, notifiable diseases such as AFB and EFB are managed with support from the National Bee Unit and bee inspectors. Official guidance changes over time as new research and risks emerge, so it is important to use up-to-date information from trusted sources.

Registering your colonies on BeeBase is voluntary but encouraged. It helps inspectors contact you quickly if notifiable disease is found nearby and provides access to leaflets, training material and local disease alerts.

If you suspect foulbrood or are unsure about a serious disease, do not move equipment or bees between colonies. Contact your local bee inspector or follow the advice given on BeeBase and through your association. Acting early and following official guidance protects your bees and your neighbours' bees.

Record-Keeping and Spotting Patterns

Good records help turn individual inspections into a much clearer picture of colony health over time. Notes about brood pattern, temperament, feeding, queen status, treatments and unusual behaviour make it easier to spot changes early and compare colonies fairly across the apiary.

Consistent records are especially valuable when problems develop gradually. Looking back over previous inspections can help identify when a colony first began weakening, whether varroa treatments were completed at the right time, or whether a brood problem appeared after a period of stress, robbing or poor weather.

If you use authorised veterinary medicines in your hives, including varroa treatments, keep a clear record of the product used, treatment dates and which colonies were treated. In the UK it is considered good practice to retain these records for at least five years.

Some beekeepers prefer handwritten notes in the bee shed, while others use digital systems to track inspections and seasonal trends. Tools such as the HiveTag web app can help organise inspections, treatment dates, apiary locations and colony notes so patterns become easier to recognise across the season.

Protecting Bees, Honey and the Wider Environment

Healthy colonies do more than produce honey. They pollinate crops, gardens and wild spaces, supporting biodiversity and local food production. Keeping on top of honey bee diseases and pests is part of looking after that wider system.

Alongside disease control, you can support pollinators by planting for nectar and pollen, reducing pesticide use and sharing reliable information with friends and neighbours. The pollination and help the bees sections on this site offer more ideas for making a positive difference beyond your own hives.

Use this diseases and pests overview as a starting point, or begin with the colony health triage tool if you want to narrow down symptoms first. You can then explore the more detailed pages on bacterial diseases, viral diseases, bee pests, parasitic mites and other conditions to build a rounded picture of honey bee health in the UK. For a month-by-month view of when risks tend to show up, follow the year in the apiary, and for focused mite control planning go straight to the varroa management guide.