Beginner Gardening: roses, 1 by Tanyusha

Tanyusha wrote:
Hello,
Does anybody know what is wrong with my roses ? They are blooming fine, but leaves on the bottom turn yellow with some spots on them and fall off.
I fertilized, sprayed, they have plenty of sun, plenty of water... Nothing helps...
I have other rose bushes, which I don't even touch: I don't fertilize, don't spray, my dogs ocassionally pee on them ! But they are doing terrific ! Been for 2 years, producing huge fragrant flowers. Is it "too much love will kill you" is happening ?
Tatyana