Maybe supercedure issue is not all due to chemical usage.  Perhaps the introduction of AHB and Russian genetics into the gene pool has contributed to this problem by producing a mongrelized bee.  Last issue of ABJ talked about crosses with AHB not having good survivability and pheromones of Russians are quite different according comments I've read on this list and in literature.  Wouldn't be a all surprised if this is not having an effect.
 
 
Jerry Wallace
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