Wplyw inwazji Varroa jacobsoni na rodziny pszczele z matkami roznych ras w czwartym roku trwania choroby

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 with caucasian queens.