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Varroosis
Varroosis is a parasitic disease of honey bees caused by a mite that attaches to the bodies of bees and infests the brood. It is one of the leading causes of colony weakening and loss worldwide. It affects both adult bees and developing lar...
What is it?
Varroosis is a parasitic disease of honey bees caused by a mite that attaches to the bodies of bees and infests the brood. It is one of the leading causes of colony weakening and loss worldwide. It affects both adult bees and developing larvae.
The disease is caused by a parasitic mite that feeds on bee tissues and brood. This parasite directly weakens bees and facilitates the transmission of various viruses associated with the colony.
Densely populated apiaries, frame exchanges between colonies, and lack of regular monitoring increase the risk of spread. Colonies weakened by other stress factors are also more vulnerable to severe infestation.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Bees may show deformed wings, smaller body size, or reduced lifespan. The colony often shows population decline, irregular brood pattern, and general weakening visible over several weeks. In advanced cases, colony collapse can occur.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Transmission
The mite spreads through direct contact between bees within a colony and between neighboring colonies, particularly during robbing or bee drifting. It can also spread through the introduction of infested brood or bees when exchanging beekeeping equipment.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
If varroosis is suspected, it is important to consult a veterinarian or qualified bee technician to assess the colony's situation. Only a professional can guide appropriate management based on the infestation level.
Prevention
Regular monitoring of infestation levels in colonies allows for early detection. It is advisable to avoid introducing equipment or swarms of unknown origin and to maintain good general beekeeping hygiene. Close follow-up with a veterinarian or bee technician is recommended to adapt management measures.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 08 August 2026
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This information is provided for educational purposes only and is not a substitute for a veterinary consultation. If you have any concerns about your animal's health, consult a veterinarian.