Eric,
I think there is some confusion over the word "trapping".  In one system, as
I understand it, The Q. is trapped on a frame for a short time and hence
Varroa females migrate into those cells containing live brood which are on
one frame only.  This is then removed for destruction and the Q. liberated.
 
The other method to which I was referring, and the one I have tried is to
"trap" varroa mites by using their preference for drone brood.  A frame of
drone foundation, or a shallow frame under which the bees will build their
own drone cells, is placed in the brood chamber early in the year.  Varroa,
in theory, will migrate to the drone cells.  These MUST be removed as soon
as capped.  If they are allowed to hatch....!!  Well it's obvious that you
cannot afford to be careless!
 
If I'm mistaken in either of these systems I am hopeful someone will put me
right.  Best wishes.
 
Glyn Davies, Ashburton Devon UK.
 
 
PS  Since writing this and before sending it I see that Dave Black has
provided a detailed explanation of the two systems.  Many thanks Dave.
>
>I am not an expert and I have never tried this method of traping mites.
>However, I do not see how it will introduce excess drones, or thousands of
>mites or select for worker brood.
>
>The method, as I understand it, is to confine the queen so that all brood
>can be disposed of.  She will be laying in any event and the mites will be
>entering cells in any event.  The only negative I can see is that in
>destroying brood, there will be fewer bees emerging in a few weeks.
>
>If I have missed something, I hope someone will let me know.
>
>Eric
>Eric Abell
>Gibbons, Alberta Canada
>(403) 998 3143
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>