Varroa Symptoms in Bees – Signs of Infestation in UK Colonies
Last updated: 1 May 2026
Varroa mite problems are not always obvious at first. By the time you see deformed wings, crawling bees or a collapsing population, mite levels may already be high. This page helps UK beekeepers recognise common symptoms and links them to monitoring and treatment planning.
Common signs of varroa infestation
- Bees with deformed or shortened wings.
- Crawling bees outside the hive.
- Patchy brood or poor brood viability.
- Visible mites on bees or drone brood.
- Weakening colony strength in late summer or autumn.
- Increased dead bees outside the hive.
Why symptoms can appear late
Varroa populations can build quietly. A colony may look strong during spring and early summer but carry rising mite pressure into late summer. This is why regular monitoring is better than waiting for obvious symptoms.
What to do if you suspect varroa
- Carry out a mite check using an appropriate monitoring method.
- Check brood and adult bees for virus symptoms.
- Compare the colony with others in the same apiary.
- Review treatment records and timing.
- Use the Varroa Treatment Calendar for seasonal planning.
For treatment options, see chemical treatments, non-chemical varroa control and PPE for varroa treatments.