 Some concerns exist about the impact of the international trade in mass @-@ produced bumblebee colonies . Evidence from Japan and South America indicates bumblebees can escape and naturalise in new environments , causing damage to native pollinators . Greater use of native pollinators , such as Bombus <unk> in China and Japan , has occurred as a result . In addition , mounting evidence indicates mass @-@ produced bumblebees may also carry diseases , harmful to wild bumblebees and honeybees . 
