An EFB-like affliction hit our few colonies at the end of April (38th 
parallel, 7500 feet).  We watched it carefully for a month, hoping that 
it would dissipate and while we arranged a more structured scientific 
effort at one of the USDA/ARS labs than just diagnosis.  It got 
progressively worse in a few colonies and really set them back compared 
to neighbor colonies that showed absolutely no signs.  Varroa in all 
colonies (infected or not) was low.  In collecting and recording a 
series of individual larvae (or their remains) from three colonies with 
the worst symptoms they were off-color, white gray, yellow, or brown, 
ranged all ages (including some partly uncapped), condition ranged from 
normal curved to straight in cells to melted.  A month after first 
symptoms, and a week after an application of Terramycin in powdered 
sugar all symptoms disappeared.  No untreated controls.

 
 

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