Help with raspberry problem- disease or fungus?
I have a nice patch of thornless raspberries that have grown and fruited well the past 2 years and sent up new plants. This spring, some of the canes have developed a problem, the leaves turning brown and shriveling, and the cane also looking brown, after flowering and forming unripe fruit. I am afraid it might be spreading to whole patch, so I have removed these canes. Anyone know what might cause this and what the remedy is? Doesn't appear to be a bug that I can see, behaves more like a fungal problem.