>
> >None of this in any way proves to me that the brood problem was caused by
> either viruses or mites.  That brood looks like EFB to me.


Similar to EFB, but with small differences.  We saw a lot of these signs
some years ago, and there may well be some of the same bacteria involved.
The slumping of the larvae is different than with typical EFB.

What I see more often with PMS are propupae, lying flat, heads upturned,
somewhat similar to sacbrood.  They are melanized.  And also
freshly-uncapped dead early pupal stages, again melanized.

I agree with Pete--these signs are very common with high varroa loads.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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