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It sounds like you have a dual problem going on with your roses. One sounds like your roses may have some Downy Mildew and need to be sprayed with a fungicide listed for control of downy mildew, not just prevention of it. Also the holes in the leaves are usually a sign of beetle attack as they poke holes in the leaves to suck the juices out. I would get some Bayer Tree and Shrub granules or Rose and Flower granules and apply such product per label instructions and water in well. And spray with the fungicide ASAP. If you notice webs like spider webs in the foliage, you may have spider mites. If you do have them, you must spray with a good miticide such as Avid or Floramite to get after them, insecticides will not kill them and can make their population grow by killing off their natural enemies. Here is an article link as well: https://www.gardeningknowhow.com/ornamental/flowers/roses/downy-mildew-roses.htm

Knock out roses are attacked by the sawfly. The larvae eat the leaves membranes and discolor them along with the plants nutrition. Buy neem oil and follow directions. Add some drops of dish soap to mix water and oil. Spray the leaves top and bottom after no sun is on the plant. Prune the plant back casually. Not a lot. New growth should return. Spray this method every few weeks.

When you say T roses, I assume you mean hybrid tea roses. First off I would check the nitrogen content of the fertilizer used. High nitrogen fertilizers increase growth that can cause more foliage and less to no blooms and can at times cause limited to no fragrance. I recommend feeding the roses with a good organic or organic based rose food, even give them all a cup of kelp meal. If the weather has been hot where you are that could be part of the problem. If the fragrance was there before, it certainly should return. I had a dear friend whom told me of this same problem once and when I checked the roses I found them to be nicely fragrant. It turned out he had a sinus condition that had developed and was not aware of it. Keep the roses well watered and give them the kelp and organic food. Let me know how things go.

You could have larvae from the sawfly. They eat the membranes on the undersides of the knock out bush and that is why the color fades. Buy some neem oil and mix as directed but also add drops of dawn to the mixture so the oil and water will combine better. Add the soap til you don't have the oil floating on top of the water. Spray leaves down with a hose first. Then let dry and spray all the leaves top and bottom with the neem oil after the sun sets as to not burn the plant. Good luck!

Spray them with an insecticide of choice. I use Bayer Complete Insecticide to get after the beetle bugs and rose worms.

Yes indeed, it sounds like you have a beetle and perhaps a rose worm problem. I would recommend spraying them with an insecticide of choice. I use Bayer Complete insecticide spray when I have a major attack going on.