Nancy, EFB appears to be a different critter than it used to be--it no
longer simply disappears when forage conditions improve.  And yes, varroa
doesn't do well in colonies that are having trouble rearing brood.

Luckily, I have yet to see a case of oxytet-resistant EFB in my own
operation.  We suffered from serious infections several years ago, and
performed a single operation-wide oxytet prophylactic treatment--the first
for us in well over a decade.  We have only seen a few cases since.

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

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