Very interesting topic to be explored, Mr. Petersen. I am also very
interested about biological control Varroa by predators. In Slovakia
the rapacious mite Chelyetus eruditus was tested, with no succesful
results. In article from ABJ, vol.128, No.2 Susan Cobey wrote, that a
scanning electron microscopy study found three types of
microorganisms, including bacteria and fungi, on Varroa mites. Varroa
is able to transmit fungal pathogens, such as Aspergilus  which causes
stonebrood. Mycelium of this fungus has also been found in Varroa
suggesting it may also be a pathogen of the mite. It could be explore
in article by Liu and Ritter - I did not found this paper.
There may be certain microorganism which attack the mites - any
suggestions ?
 
              Best wishes
                         Robo
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