>
> It has been shown that requeening a EFB hive with Minnesota Hygienic bees
> will not stop the problem and I run MH queens.  Are they particularly prone
> to EFB?


The test to determine % of hygienic queens in the MH line was to freeze 100
cells of capped brood and count how many of the cells were removed after 24
hours. Diseased, abnormal, dead capped brood is what the MH line attacks.
EFB predominantly affects uncapped brood (as opposed to AFB). The MH line
may have other characteristics (such as being hygienic in other areas,
other than capped brood), but % of capped brood removed is the test.

I don't believe MH genetics are more prone to EFB, just that they don't
clean it out like they do other diseases. Jennifer Berry commented that she
noticed a similar issue. The more hygienic her queens got, the more she
needed to stay on top of EFB.

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