Electro-magnetic radiation

[fatshark]

But sound vibrations are a great way to clear a hive of those pesky Varroa ... though I think they use ultrasound (14.5 - 15kHz)

 

[For want of a better word]

But sound vibrations are a great way to clear a hive of those pesky Varroa ... though I think they use ultrasound (14.5 - 15kHz)

Perhaps that bee whistle I was given was to scare away the pesky mites... couldn't hear it anyway.....
BUT I can still hear the Christmas bell ring... I Believe!!

Nadalek Lowen

 

[oxnatbees]

But sound vibrations are a great way to clear a hive of those pesky Varroa ... though I think they use ultrasound (14.5 - 15kHz)

Strictly speaking, 15kHz isn't ultrasonic for children (they can hear 20kHz). And though your high freq response tails off as you age, I could certainly hear it aged 40. The classic way of losing high freqs is listening to too much loud rock music! ;8

 

[Hebeegeebee]

Fairys do the same

 

[Gilberdyke John]

But sound vibrations are a great way to clear a hive of those pesky Varroa ... though I think they use ultrasound (14.5 - 15kHz)

Wasn't there an ultrasonic varroa killer being touted a few years ago but under thorough testing it was shown to have zero effect?