Apivox Auditor. Theoretical Foundations of the “winter control” option

Winter control of bee colonies is very important procedure, especially in cold areas with long winters and subs zero temperatures. These two factors make impossible, the free movement of bees inside the hive also their cleaning flights. Any inspection of bee societies at such time leads to their anxiety. Anxiety increases the activity of the bees, so the bees eat more food. This leads to an overload of their intestine which during long wintering period can lead to serious consequences.  An inspection method with minimal disturbance of bees would be ideal. Acoustic inspection of bee societies in winter time seems to be the best one.


What are the theoretical foundations of this method of control used the Apivox Auditor?  In this case, we relied on the studies of Russian scientists & beekeepers and in particular, on the works of Professor Eskov. His works describe the general state of the acoustic characteristics of wintering bee societies. In addition to this we have made our own tests and observations on our experimental apiary. So what does the Russian scientist claim? Based on his research and hundreds of measurements of acoustic background of wintering bee societies, it is possible with high degree of confidence assert,  that there is a direct relationship of the concentration of carbon dioxide in the hive, and the strength and intensity of ventilation, as well as the state and excitation of bees, during the winter season.


1) With the increase of CO2 concentration in the hive from 2% to 5-7% there is growth of ventilation force and intensity. This is an increase in amplitude and also in frequency of ventilation audio signals. It rises about 50 hertz. This shifts the peak of intensity within the sound frequency band of 70-180 Hz *1 the shift is from the range of 70-100 Hz to the range of 100-120 Hz. There is also a corresponding increase of intensity in the “WORKING STATE” sound audio band *2.  The intensity of the peak signals shifts from frequency range 200-240 hertz, to frequency range 240-270 Hz.


2) With the increase of CO2 concentration in the hive from 9-10%, there is a much greater increase of ventilation intensity.  The intensity peak of the ventilation sound signals moves to the frequency range 120-140 Hz, also intensity peak of signals, which tell us about the state of the bees, shifts from 240-270 Hz to 300-340 Hz.



*1 The “VENTILATION” sound audio bandwidth spans is the ……………..         Low-frequency range from   50-190 Hz

*2 “WORKING STATE”  sound audio bandwidth, is the ……………………          Mid-frequency range  from 200-400 Hz.


this also includes the sounds of forager bees, this is the …………………….       High frequency range          400-550 Hz .


The degree of infection of any bee society with varroa mites, also affects the state of the acoustic background of wintering bee society. The more infected the bee society is, the more intense are signals in the “WORKING STATE”  sound audio bandwidth 200-380 Hz *2. According to the analysis of the spectra of background noise in 376 hives by Professor Eskov, he stated the following…

1) In the bee societies where the infection was 2-8%, the peak signals characterizing the “WORKING STATE” is positioned in the frequency range of 270-300 Hz,

2)  In the bee societies where the infection was 50%, the peak signals characterizing the “WORKING STATE” is positioned in the frequency range of 300-380 Hz,

It should be noted that the strength of signals (the amplitude) was not of fundamental importance. It means that it is not possible to use the power (the amplitude) of sounds of wintering bee society to determine the degree of infection of the bee society with Varroa mite. Only the frequency range, in which peak intensity is situated is meaningful.   It is only the frequency shift that indicates the state of a bee society.

So the “WINTER CONTROL” option of Apivox Auditor is using the results of researches of Russian scientists on this topic. We hope that this “WINTER CONTROL” option will help beekeepers in countries with long cold winters to monitor their hives easier, and reduce the deaths of bee colonies due to the timely checks.

Apivox Auditor makes it possible to carry out an inspection of bee societies just in a few minutes without opening the hive.

Apivox Auditor available from info@thebeezone.org

or directly from Apivox Auditor


APIVOX AUDITOR the Beekeepers Acoustic Assistant