What about Braula coeca?

I have this yard where 70 out of 80 colonies dissapear (the bees not the
boxes;). Boxes full of reserves, no robbing. Yellow jackets only entering in
the surviving boxes. No ants, no wax moth.

 We harvest 30 kg average beggining of summer. We took frames of capped
brood for nucleos. At autum inspection colonies in two boxes.

The remaining colonies most in bad shape only 3 may survive the rest of
winter. Mostly dark bees (I have a great mix including Austrian carniolan
genetics). Only yard without fumagilin treatment in autum. Last Varroa
treatment with formic (other 1000 hives with same treatment product and time
in good shape, but with fumagilin treatment).

Bees full of Braula coeca. Never seen before. None on other colonies as far
as we can inspect in winter.

I left the yard as it is, last visit a month ago. Now raining heavy,
impossible to access there.

Any suggestion on how to approach this yard when I have access and time?

What to do with survivers? Left them there or move them close to home? (at
home I have all my nasty experiments in search of survivers). Yard some 70
km from home, expensive trip for 3 colonies.

What to do with the honey? Extract it and sell it?
What to do with the equipment? (No gamma irradiation facility here).

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