Perhaps this statement from the NORTH AMERICAN BLUEBERRY COUNCIL will help:
...SNIP..."The NABC, along with blueberry sellers around the globe, are frequently asked by buyers whether or not they carry or process any GMO blueberry fruit. At this point in time we can all state unequivocally that there is no GMO blueberry fruit grown or in commerce. Our industry is able to avoid this issue."

Blueberries are perceived by the public as a health-promoting food. It is imperative to our economic well being that nothing is done to alter this view. A tarnish on this image would be much worse than any perceived benefits that we could see to GMO blueberries at this time"

http://www.smallfruits.org/Blueberries/production/NABCposition.htm

Thanks