In article ,
Roger Tonkin wrote:

Then plant new ones in the same location! I really do mean
that there is no hope of any of the Rubi recovering once they
have started to go downhill. They haven't adapted to recovery
from fungal root-rots, viruses etc. and rely on new plants
taking over. Longer-lived and more woody plants have some
recovery mechanisms, but Rubi are not like that.

That's encouraging, but I understood you should not
use the same patch, partly because of the problems you
outlined.

Ideally, you shouldn't. However, in the wild, they often tip-in
or sucker into areas where other canes have just died. I find
that young plants (not raspberries, but others) often thrive
even where and old one has been dying horribly.


Regards,
Nick Maclaren.