1 daughter colonies of the 4a were tested:
DE-6-52-82-1997
1 tested queens were mated at the mating station:
DE-6-52-82-1997
9 daughter colonies of queens mated at the mating station were tested:
DE-6-52-275-1999 DE-6-52-279-1999 DE-6-52-280-1999 DE-6-52-282-1999 DE-6-52-284-1999 DE-6-52-285-1999 DE-6-52-287-1999 DE-6-52-288-1999 DE-6-52-291-1999