The change of the location of the beehives on the diverse honeyfull pastures is the usual apiarists activity in the Republic of Croatia. The main reasons are the climatic and vegetation diversity, and richness of the floral composition, with numerous bee forage plants. Our study aimed to detect consequences of honeybee broods (Queen-bee of different lineage) moving, from one habitat to another at various type of beehives. The Alberti-Znidersic (AZ), Langstroth-Root (LR) and Dadant-Blatt (DB) beehive types, constructed of (lime-tree), have been used. After the bee forage on the Oilseed Rape in the beginning of April, the honeybee brood has been veterinary inspected (based on the Law of animal health protection in the Republic of Croatia) for varrosis, nosemosis and American foulbrood diseases. The same procedure was done after bee forage (False acacia) at the end of May. All of the honeybees belong to the European race Apis mellifera carnica. The results of the study pointed out that different beehive types and the Queen-bee lineage (natural and selected) affect development of disease inside the honeybee brood, during the relocation and change from one dominant bee forage plants to another. Certain allergy reactions occurring in people can be caused by the pollen of some honefull plants such as birch, grasses, ragweed, goldenrod and hazel. Such cases are also included in our investigations. Beekeepers and nature lovers sensitive to pollen allergens of some honeyfull plants should, in some calendar period, avoid ecological milieu with such plants.