🔬 Laboratory Diagnostics for Beekeepers

About this simulation

UK beekeepers rely on a small set of quick, low-cost diagnostic tests to catch disease and parasite problems before they become colony-threatening. This bench shows three of the most common ones side by side: the alcohol wash for Varroa mites, microscopy for Nosema spores, and refractometry for honey moisture content.

How it works

• Alcohol wash — roughly 300 bees from a brood frame are shaken in alcohol or windscreen-wash fluid; mites detach and sink through a sieve, giving a direct mite count per 100 bees.
• Nosema microscopy — bee midguts are macerated and examined at 400x; spore density is compared against a rough infection scale to judge treatment need.
• Honey refractometry — a drop of honey on a refractometer gives moisture %; UK Honey Regulations set a legal ceiling of 20% (except heather honey) to prevent fermentation.
• APHA (Animal and Plant Health Agency) inspectors confirm notifiable diseases like American and European foulbrood in a laboratory before statutory action is taken.

Controls

• Bees sampled — sample size for the alcohol wash (a standard sample is ~300 bees, about half a cup).
• Varroa mites / 100 bees — the underlying infestation rate; drives how many mites appear in the jar.
• Season — treatment threshold tightens heading into autumn, when brood-rearing mites threaten the long-lived winter bees.
• Nosema spores — spore density seen under the microscope field.
• Honey water content — moves the refractometer needle and checks against the UK legal limit.
• 🫧 Shake sample — re-runs the wash, resuspending mites before they resettle.

Did you know?

A sugar-roll count is a non-lethal alternative to the alcohol wash — bees are dusted with icing sugar instead, which makes mites lose their grip without killing the sample, though it slightly undercounts mites compared to alcohol.