[ prevalence of nosemosis in the colonies of bees apis mellifera intermissa in the médioseptentrionale region from Algeria]

The objective of this work was to study the prevalence of nosemosis, a disease caused by a protozoan Nosema sp. in bee colonies Apis mellifera intermissa. Samples were taken between late February and early March on eight apiaries in 3 regions with high potential beekeeping activies [Blida, Boumerdes, Algiers]. This study showed that 44.7% of the colonies were infected with Nosema; the heavy infestation was related to the sampling period [February, March]. Apiaries in the Boumerdes region were characterized by an infection rate of 56%, this rate was significantly higher compared to rates in the apiaries of Blida and Algiers. This high prevalence of Nosema in the Boumerdes region is linked to climatic conditions [high humidity and long winters]