Nosemosis

Summary

Nosemosis is a fungal disease of adult bees caused by Nosema spp. 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.
This practice describes the two forms of the disease caused by Nosema apis and Nosema ceranae, how they are transmitted. It also provides some indications on how to control the disease.

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