One is the long-distance transport of bees for pollination and the spread of bee diseases from one area to another.

VOA: special.2011.05.24

There are also challenges from bee diseases, although he believes pesticides are not a major issue in the city.

BBC: Making a bee-line for city roofs

The results will be used to inform future decisions relating to bee health and treatment of diseases, pests and emerging threats.

BBC: First Scottish bee health survey gets under way