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Infestation of commercial bumblebee (Bombus impatiens) field colonies by small hive beetles (Aethina tumida)

Abstract 1. The small hive beetle, Aethina tumida, is a parasite of honeybee (Apis mellifera) colonies native to sub‐Saharan Africa and has become an invasive species. In North America the beetle is now sympatric with bumblebees, Bombus, not occurring in its native range. Laboratory studies have shown that small hive beetles can reproduce in bumblebee colonies but it was not known whether infestations occur in the field.