Leaves of Roses with yellow spots and turning yellow
I am new to this forum and also a novice gardener and look forward to your wisdom and help here.
The leaves of my roses are turning yellow and then brown... It all starts with yellow dots on the leaves, and then eventually the entire leave is yellow and then turns brown. I am not sure what the diagnostic is here. Earlier in the season, I had aphids and I treated the roses for that, this time around, I do not see much insects.
I've included a short video on the link to show what it is for your reference: http://sharing.theflip.com/session/c559556fbc1e2950957c6d037e71e0b4/video/4388130
I'd appreciate any suggestions here on how to treat those roses.
Thank you for your help,