I have about 30 rose bushes around my yard and have had this problem for a few years. Before long the canes are bare or just have leaves on the end. This year they were finally looking great big and bushy, lots of blossoms. Then I got aphids, cured them with hose water bathes. Next it was rose chafers, They are mostly gone now because I used 3% soap water spray and knocking them into soapy water. The plants had started to recover and now the leaves are turning yellow and black and falling off from the ground up. It seems to be spreading to the rest. Any help would be greatly appreciated. thank you!