Turn those leaves over and look underneath. Do you have a magnifying glass if needed? There are so many culprits that could be hiding right now, under the leaves. Down here, we're covered up with bugs, especially in the summer. Best advice is definitely head to the garden shop for some help.

I personally keep something on hand that is a combination fungicide/insecticide. I can't remember the name but Wal-mart even carries some good ones. I think it's called Safer. Always remember to spray the underside of the leaves and not just the tops. While the tops are protected, the bugs are eating away underneath the leaves and destroying the plant. Also, Ortho has a good combo you can get. It's granulated, in a tall can with a picture of roses on it. It's great. Roses are very susceptible to all kinds of things but with a little TLC every couple of days, the rewards are worth it.

To save a trip to the store if necessary, I mix some water(a cool whip size bowlful), a drop of dish soap, and a capful of alcohol(from your medicine cabinet). I wear gloves and bathe the leaves of the plant with cotton balls(anything small). This will wash away most problems and it's good as new. You may need to repeat in a week or two. We have a guy here on tv called the Garden Rebel. He gives out these recipes all the time. Good luck!!

Also: Go to Home Depot, Lowe's-whatever you have and buy one of those $5 water gauges. You may be over watering even though it doesn't seem like it. That gauge is the best thing I ever bought.