>  Most bees these days have some hygienic traits due to mites and those bees remove diseased larva so fast in my experience I do not see the classic symptoms of EFB such as discolored larva.  All I see is empty cells which should have larva in them.

So what makes you diagnose this as EFB rather than, say, inbreeding or queen problems?

Best wishes

Peter 
52°14'44.44"N, 1°50'35"W

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