75% of the most threatened bee species have been lost to some of the region's counties.
A report by nature conservation charity Buglife says the large garden bumblebee (Bombus ruderatus) is still found in Gloucestershire and Somerset, but over the past 50 years has disappeared from Dorset and the far South West.
The increased use of pesticides and unpredictable weather have contributed to their decline.
More top news
Bob has the forecast for Devon, Cornwall, Somerset and Dorset
Bob has the forecast for Bristol, Wiltshire, Somerset, Gloucestershire and Dorset
Popstar Sandi Thom has released 5 albums in her career but during her recent pregnancy she suffered from pre- and post-natal depression.