During an external examination of the experimental hives, it was noticed that in the two strongest families the temperature in the nest was significantly higher than 30 degrees Celsius. This was puzzling, since the week before, all remaining brood had been removed and all insulation had been removed in order to ensure a smooth transition for the bees to cold wintering. But the weather is too warm for the end of September. Despite the cool nights, during the day it warms up to +20C and above. We decided to conduct an acoustic control in the evening to check for the presence of open brood, since we did not observe any sealed brood during the inspection.
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The check shows that the bees' signals correspond to the presence of a sufficiently large amount of open brood in these two families.
