Weight loss in drone pupae (Apis mellifera) multiply infested by Varroa destructor mites

Abstract

Colony losses caused by varroatosis in the western hive bee, Apis mellifera, are mainly due to worker bee injury by Varroa destructor mites during preimaginal development. These effects have been examined repeatedly; however, little is known about effects on drones. Here we present the first exact data on individual drone weight loss, especially from the red eyed pupal stage onwards. The resulting reduction in weight of adult drones was related to the number of female mites (up to 20) that had invaded a brood cell. Weight loss was significant even if only one female mite was present. From several of the heavily infested brood cells adult mini-drones emerged.