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It sounds like some sort of burning rather than insects or funguses. I have seen such things caused by spray drift. Spraying weed killers or even some insecticides and the spray drifts over onto the roses foliage. I also have seen this happen when the roses were sprayed with an insecticide during cool cloudy weather and it sat in droplets upon the foliage too long. Another thing can be cat or dog urine that has sprayed up onto the foliage. Rinse the foliage all off with a water wand watering device on the end of the garden hose and hopefully you will not see any more of it. If none of the above seem to be the issue let me know and I will look into it some more. Send some photos too if you can.

Some roses blooms will bleach white in the hot sun as they die back, especially yellow roses seem to lose their color quickly. Light pink is another one that fades out sometimes, red normally not. If you mean the foliage is turning white, you likely have a Powdery Mildew problem and need to spray the rosebushes as soon as possible. I recommend spraying them with a product called Green Cure at the Cure Rate at 5 day intervals if the powdery mildew has a strong hold. The green flying bugs could be aphids and they can become a problem as well. An insecticide spray may be in order as well if you notice large clusters of them forming on the buds and foliage of your roses.

I live in Northern Colorado. Many of the rosebushes here have canes that die way back, sometimes so much so that I prune them back to within 2 inches of the ground surface if not more. Most of the time they come back okay. If you pull the soils back at the base of the canes and see some green cane material they should come back. If the cane is black well down into the ground and to the union point of the canes, it may have died.

To keep it blooming you need to dead head it/prune off the spent blooms. I do a bit of a shaping pruning after they are done blooming to keep them in the shape I like. Then more buds will come on. Also watch the nitrogen content of the fertilizer you feed her with. Too much nitrogen and you will get lots of growth and foliage but sparse to no blooms.

Remove the soils of the infected rosebushes to a diameter of 20 inches and the same depth. Replace those soils with amended bagged garden soil. By doing this you also remove most of the old root systems that might still carry some of the virus. Most any rose can get the dreaded virus as it is believed to be spread by mites. Even the hardy knockout roses have fallen victim to it of late. So just really look over the new rosebushes you buy and get good healthy looking bushes. If you want an awesome pink climbing rose to replace New Dawn with, try one named Awakening. She is related to New Dawn and many say she is better. I found her to be a very good happy and hardy rosebush.

Some rosebushes take a little longer to get with the program each year. Where I live we frequently have to prune the rosebushes down to within 2 inches of the ground due to winter dieback. SOme rosebushes do not like to do much until we get consistent 50 degree nights. Once the soils warm up and things get consistent temperature wise they usually get with the program of growing. As long as there is green color there is hope. If it starts turning brown to black, then hope fades and it is time to consider some new rosebushes that you always wanted to grow.