I looked at your website..
If I read correctly, it seems likely that your bees may have 
requeened-perhaps multiple times- while surrounded by the bees of the 
migratory beek. This of course would mean a dilution of your genetics.It 
doesnt preclude the possibilty that you are on the down side of what may be 
a  pathogen-bee dance, or some "new" pathogen, but I would expect 
degradation based on dilution alone(of course the severity would depend on 
the genetics of the migratory beeks bees).
John Horton
N Alabama 

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