The Q&A Archives: yellow leaves on knockouts

Question: Eight of my fifteen or so knockout roses were attacked by tiny worms in late spring.
I used sevin to get rid of them after they had been practically decimated by the worms..
Since then, their leaves are falling after turning yellow and they look sparse.please help me..the roses in the front are doinf ok, but they weren't attacked as badly.
I have fertilized to no avail.HELP!!


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