Whilst cutting down the fruited canes (fabulous harvest)of my summer raspberries I have noticed the new canes have strange blotches on ::) initially a black blotch at base of cane but I have noticed a few also have blothes further up the cane.
My initial thought being blight I have checked out the web but its nothing like the pictures shown. Has anyone any thoughts as to what it might be - what to do, do I just cut the effected canes out to be on the safe side?