Hi James,

Why not try the opposite of this.  Why not try small cell foundation?
Dadant sells this right next to the drone foundation.  You don't have to
remove this from the hive.  But you need to replace all combs in brood nest.
If you forget to remove drone comb you have made varroa populations increase
rather than decrease. Why not control varroa by giving them no where to
breed (except drone comb with is the size of the worker comb you are now
using).  Drone comb must be limited in these small cell colonies to no more
than 10% drone cells per frame. No chemicals will be needed in these
colonies as mite populations are naturally supressed.  The criticism of this
method is that few have tested it(scientists).  Yet independent beekeepers
are finding it to work.

Clay