I have seen lots of Xylocopa holes in flowers of highbush blueberries
in Ontario. I watched the bees make the holes with an audible crunching
sound. Only one species gets into Ontario and its range seems to
stop just south of Guelph. It appears to be an insect of the Carolinian
zone and can be quite abundant. I don't know whether or not they would
enter Nova Scotia. Cheers, Peter