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Nosema apis
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Nosema apis

fungus

Learn about this topic in these articles:

cause of disease in bees

  • In Nosema

    Another species, N. apis, attacks the gut epithelium of honeybees (especially workers) and causes nosema disease, a serious form of dysentery in animals.

    Read More
  • bees on a honeycomb
    In beekeeping: Diseases

    …disease, caused by the microsporidian Nosema apis, is the most serious disease of adult bees. It is widespread, causes heavy losses in honey production, and severely weakens colonies. The external symptoms of bees with nosema disease are not apparent. The disease is transmitted from adult to adult by ingestion of…

    Read More
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microsporidian
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microsporidian

fungus
Also known as: Microsporidia
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microsporidian, any parasitic fungus of the phylum Microsporidia (kingdom Fungi), found mainly in cells of the gut epithelium of insects and the skin and muscles of fish. They also occur in annelids and some other invertebrates. Infection is characterized by enlargement of the affected tissue.

Microsporidians have minute spores (2 to 20 micrometres, or 0.00008 to 0.0008 inch) that contain a single polar filament and the infective parasite (sporoplasm). When spores are ingested by a new host, the organisms enter the gut epithelium and reach specific tissues through the bloodstream or the body cavity. In the host cells they grow and repeatedly divide asexually. The mature parasites (trophozoites) eventually give rise to sexually produced zygotes that produce new spores. The species Nosema bombycis causes the disease pébrine in silkworms (see Nosema).

This article was most recently revised and updated by Kara Rogers.
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