No idea but on a quick search, this sort of explains some more

http://www.imkerplatform.nl/component/content/article/60-opmerkelijk/333-hopguard-the-new-varroa-pesticide

<http://www.imkerplatform.nl/component/content/article/60-opmerkelijk/333-hopguard-the-new-varroa-pesticide>--

Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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