Yes as Peter Keating points out, and as the article from New Zealand
reports, and I quote from the latter: 
 
"The concept of using the fungus to combat varroa is not new, however
other attempts to develop a commercially viable Metarhizum -based
product have failed because the fungus is rapidly removed from the hive
by the bees themselves as part of their normal hive cleaning and
maintenance behaviour.
 
HortResearch honeybee expert Dr Mark Goodwin says his team have solved
this problem by finding a way to keep the fungus within the hive;
ensuring populations remain high enough to achieve mite control".
 
But even if it works, there is as yet no indication of the cost of
treatment, and also will there be questions about possible fungus
contamination of honey?
 
Barry Donovan,
New Zealand.
 
 

 


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