>Is this a residual of virus symptoms after varroa gone?
> How long does it take these symptoms to disappear if the vector (Varroa)
> is not present or at a very low level?

This is the opposite of what I see.  In the early days of varroa (1997) we 
saw many deformed wings.  Now I could go through 40 hives and just find 
perhaps half a dozen at most.

Varroa levels are under control - but not exceptionally low.  We have always 
used thymol crystals for varroa control and do not therefore expect 
exceptionally low levels.

We do, however, score colonies for deformed wings on a 1 to 5 scale (5= 
none, 4= one or two, and so on).  We never breed from queens with less than 
a perfect score of 5.

Best wishes

Peter
52.194546N, -1.673618W 

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