It might depend on the country of origin but in the UK Blueberries, unless of superior quality, do need their crown cut off as that is an area of common infestation. They also need rinsing.
Strawberries can also be quite often infested, at least again in the UK.
If you buy any of these in order to make a smoothy from it, i.e. to liquidize it for a drink, you might not need bedika. However you may not liquidize it BECAUSE they are infected. Ask your local Posek