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Date: | Fri, 15 Jul 2016 07:53:12 -0700 |
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>Why do many use drone brood removal a part of their IPM program if there
are only a few mites in the green drone sized frames.
Sometimes there are plenty of mites in drone brood. That's why I suggest
actually checking with a cappings fork prior to removing the drone brood.
If you see mites, then remove the drone brood.
>
> I mean, if a colony have between 10% to 20% adult drone population and
> assuming an even distribution of foretic varroa between drones and workers,
> varroa load over worker should increase when drones are expelled from the
> hives at summer end, should it?
There is not an even distribution--varroa preferentially ride on nurse
bees. Also, if a drone is expelled, so are its mites.
--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com
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