Hi

There is a good information on this on the internet:
http://westsoundbees.org/beekeeping_articles_sugar.htm

I have tested the method this fall and it worked but uses quite a bit of
work. I then tried to put the powdered sugar on top of the combs through a
sifter, whereby some sugar went between the combs also, which was
appreciated.
Then I took a small brush to wipe the sugar from the top bars between the
combs.
The bees were quite good dusted this way and many varroa dropped down. this
was
much faster then opening every comb and dusting it individually.

My friend also used another technique when he had to shake the hive off its
combs anyway to renew all combs (in Switzerland many beekeepers exchange the
combs after 3 years at the lastest in order to have clean hives with no
residues
from treatments). He shook the hive into a big bucket then put the powdered
sugar
into it and closed the lid. then he shook the whole think and let it rest
for
approx. 3 minutes. Then he emptied the bucket onto a fine net where Varroa
fell
through and put the bees back into the new hive. Lots of varroa fell off
like
this.

dieter schuerer, switzerland

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