Nosemosis is a disease of adult bees caused by unicellular fungi belonging to the Class: Microsporidia, Family: Nosimatidi, Gender: Nosema.
There are two different sub-species of Nosema that affect Apis mellifera with different prevalence depending on the area: Nosema apis and Nosema ceranae, responsible for two different forms of the disease.
Both N. apis and N. ceranae have a dormant stage, a long-lived spore.The spores are hardly morphologically distinguishable between the two species and represent the resistance and propagation form of the disease (Fig.1). Spores can remain infectious from a few days up to five years at low temperatures. Heat, as well as solar ultraviolet radiation, can kill them in a few hours.
This practice describes how to recognise the two forms of the disease caused by these pathogen types.

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