Knockout roses disease

I have one knockout rose bush I planted 2 years ago and two I planted this year. All now have the leaves on them that look like there is something eating them. Looked and cannot see any evidence of any insects. I have sprayed them with water mixed with dish soap. That did nothing. I then purchased Ortho Rose spray. Neither worked. Today, I noticed that it looks like the leaves are dying. This is my first experience growing knockout roses. The bush that is 2 years old was doing great. It survived our Wisconsin winter and has grown. They are planted on the east facing side of my house. Am hoping you can help me.

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1 Comment To "Knockout roses disease"

#1 Comment By roseman On 07/04/2016 @ 9:22 am

It sounds like you have a tenacious bug problem, likely some type of beetle. The attack sounds pretty much full on, so I would do two things in such a case. I would spray the rosebushes with Bayer Advanced Complete Insecticide and then also give them a treatment of Bayer Tree & Shrub granules. This two pronged approach should get them back to good health and performance.

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