rose plants problem

See if you can get some ladxy bugs to set free near your roses. I have always been told that they eat aphids.

http://www.getridofthings.com/get-rid-of-aphids.htm
This web site verifies the lady bug thing.

http://www.arbico-organics.com/organic-pest-control-beneficial-insects-organisms.html
This site sales lady bugs. I have not used it so I do not know its reliability. Hope this helps.

Try Bayer advanced bonide or Ortho Max Home Defense sprays. They both work well (Ortho Max even works on Japanese beetles) but you must reapply after it rains as this does wash off the insecticides.
Soapicides will work too, but I prefer the sprays.

Good luck.

Hi ya! My mom, when she was alive, was an excellent gardener... the envy of her neighborhood kind of thing:D I learned a great deal from her, including "home remedies" for some insects. This will sound weird, I guess, but purchase Sunlight dish soap (the kind for hand washing, not dishwasher). Put a good quantity into the container of a sprayer and add warm water to fill. Spray this soapy water over any and all of your plants, flowers, bushes... it isn't harmful. I don't know why it was Sunlight brand specifically but I guess it has something to do with the stronger citrus. Anyway, it certainly works for me. I also make this same mixture in a small watering can and pour it into all the crevices between my patio blocks... I get ant hills that crop up and this works like a charm. It's not permanent, of course, so I go out and treat for the ant hills every couple of weeks or whenever I see new ones show up. We have a pesticide ban in the community where I live so we have to find other ways to deal with insects. I stock up on a couple of big bottles of Sunlight in the spring and use it faithfully. Very budget-friendly and, as I said, I've had quite a bit of luck with it.:D