Hi, friends,
for those who have more colonies:
 
1. Add a comb containing open young brood together with adhering bees
   to the treated colony. (The brood pheromones will turn the laying
   workers back to the normal ones.)
 
2. The week later destroy eventually constructed queen cells, add another
   comb with the youngest  brood and bees and let the colony to raise a new
   queen. After she has established brood nest and many young bees emerged
   you can eventually change it for a genetically more valuable one.
 
Vladimir Ptacek
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Fac. Sci., Masaryk Univ.
611 37 Brno, Czech Republ.