RASPBERRIES IN THE POTATOES

Cut them back as far as you can.

Totty

I don't have the space to let my raspberries do what raspberries are wont to do, so 2 years ago I installed an 18" deep vertical barrier about 18" away from the row and up to now it has kept the would-be invaders out of the veg patch.

I used a double thickness piece of spare pond liner but something like corrugated plastic would probably be easier to install if you can find some of the appropriate width.

Meanwhile, you can only remove the suckers as best you can until you can dig the trespassing roots out properly.