HONEY-BEE HYGIENIC BEHAVIOR AND DEFENSE AGAINST VARROA-JACOBSONI

Hygienic and non-hygienic colonies from 'Starline' stock of Apis melli fera were tested for their ability to remove pupae infested with Varro a mites. The hygienic and non-hygienic lines were selected and bred on the basis of their removal response to freeze-killed brood. A Jenter Box(R) was used to test whether they would remove experimentally infes ted pupae following methods of Boecking and Drescher (1992). In 1994, the hygienic colonies removed significantly more pupae infested with o ne mite per cell than the non-hygienic colonies. In 1995, there was no significant difference between the hygienic and non-hygienic colonies when one or two mites were introduced per pupa due to variation in re sponse among hygienic colonies. There was no significant difference be tween the rate of removal of infested pupae from the Jenter Box and fr om natural wax comb by the hygienic colonies. The number of mites dama ged by grooming ranged from 6.0 to 42.3% among all colonies. The repro ductive success of the mites not removed from the cells by the bees wa s low in both hygienic and non-hygienic colonies.