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Nosemosis is on the list B of International Animal Disease Office. Nosema apis was found in Poznań voivodship apiaries. The level of invasion of this parasite was 0-40% of investigated colonies in particular apiaries. According to the Polish programme only 20% of colonies can be N. apis positive in a honeybee breeding apiary. It is suggested that the minimum should be 30% in a reproduction apiary...
The objective of the work was to determine the effect of invasion of Varroa jacobsoni on the bee colonies of different breeds in the fourth year of varrosis. It was found out that bee colonies which were not treated died in the fourth year of the disease, while treated ones were debilitated. The main loss concerned the bee colonies with augustonian and carnica queens. The most resistant were colonies...
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