I live in west pa, so i can't speak for everywhere
I have cultivated red raspberries growing at the edge of woods and in beds in the yard,
some have mixed with wild black raspberry volunteers with no problem
they have even hydridized so I get some mixed berries - large like the reds but more of the wild flavor
I fortunately do not have any virus problems
I grow the raspberries in mixed beds with other plants and keep the ground covered with leaf mulch
neighbors include comfrey, mint, hostas, pawpaws, blackberry, black locust, staghorn sumac, june berry, autumn olive, black currant, creeping charlie, wild violets,hansen bush cherry, yarrow, asparagus and various assorted weeds.
can you change to marionberries or honeyberries ? something that is not susceptible to the same kind of infections?
was it a virus or rootworm/nematode?
would be tempted to contact county extension folks, and see if they know what is attacking them first.
If you find out what caused your problem please let us know.
Laurel Buckwalter wrote:For clarification, we have woods on both sides of our property but the site does get pretty much a full day of sun, minus an hour maybe at each end of the day. The plants that are there bear fine but the patch has slowly been dying out, with no symptoms that I can see. The canes that are there look fine, but they are getting fewer and fewer in number.
What have you been doing about pruning, fertilization and mulching? Have you done a soil test? What are the other plants that surround the canes? This info may help narrow down the culprit.
they seem to do fine but I'm not aware of any viruses
What type of soil are they in? Sun ? Shade? Water? Mulch? Companion plants? Are you "feeding" them?