When I was younger I remember going berry picking with a net (similarly to a butterfly net) and a racket. Where you would whack the blueberry bush with the racket and catch the blueberries knocked off with the net. I'm trying to find the English name of this method. (Reason: I want to show my wife this method and I'm trying to look up the dos and don'ts and what type of "racket" I need for it)
In my research I've been able to find an image of someone doing it at tourduquebec.ca:
I've also been able to find a mention of the act on a historical webpage of the Québec National Library and Archives:
Moins fragiles que les autres petits fruits, les bleuets peuvent se cueillir à l'aide d'instruments et selon des techniques très simples. Par exemple, on les cueille «à la tape» ou «à la claque». Cette technique consiste à taper sur les plants à l'aide de la main ou d'une «tapette», nom donné à divers objets comme un couvercle ou un poêlon, de manière à faire tomber les fruits dans un contenant.
Google translate for convenience:
Less fragile than other small fruits, blueberries can be picked using very simple tools and techniques. For example, they are picked "à la slap" or "à la slaque". This technique consists of tapping on the plants using the hand or a "swatter", a name given to various objects such as a lid or a pan, so as to drop the fruit into a container.