I have some blackberry plants that I've had for a few years. Last fall, I cut them back and they seemed to have filled in nicely this spring. I just noticed a few days ago that some leaves of a few plants have curled up like they're getting ready to die. Upon further inspection, I noticed that one of my other blackberry plants has one cane that looks like it split and big warts are all over it! I'm not sure what it is, but I have never seen this before and don't have a clue how to get rid of it! Will just cutting the cane just below it be enough or will it still spread? Also, will it spread to my other canes and ruin them as well? Can anyone help me please?!