Dying Raspberry Canes

Last year I noticed dead and dying raspberry canes in my row of Glen Amples.  I cut them out but then the next plant along started dying.  This year more canes wilted and when I dug them up the roots were dead.  Should I dig up the rest of the Glen Ample row?  My rows of Polka and Glen Moy seem unaffected.  My fellow allotmenteer two plots along is having the same problem with Glen Ample.  He has offered me a loganberry to fill the gap but I'm wondering if this could also die of whatever disease seems to be in the soil.  Chrisann