4.2.2. Marking bees according to their hives
Strains of bees with the visible mutation cordovan can be used as it is possible to identify these workers in the field (Gary et al., 1981). The bees in a colony can also be fed with radioactive elements (Levin, 1960) or made to walk through a marking block fitted to the entrance of a hive that marks them with coloured dye (Howpage et al., 1998). Workers marked with any of these methods can be searched for in the field.