I'm 45 miles West of Ft. Worth TX, whatever zone that is.

I've used a product made by a well known manufacturer (starts with "B") that is a concentrate you mix up with water and then water plant with it. It's a rose and flower care product that has 3 systemic products in 1.

Attached are 2 photos.

Please help. I've had some of these bushes for as long as 10 years. Thank you.

I guessing here.
Sounds like you are using one of the Bayer combo products. Many of us here do NOT recommend those 3-in-one products--often they give the rose much more than it needs. Certainly, if you were not having problems with fungus or with insects, your roses did not need an insecticide or a fungicide. And some posters have noted that the "feed" part--the fertilizer--might be too strong.

I'm guessing your roses are suffering from too much nitrogen--nitrogen-burn. All you can do now is give them a good deep watering to try to wash away some of the effects of the nitrogen and then wait patiently for the rose to put out some new leaves.

The other possibility that occurs to me is you have a severe spider mite problem. They are so small that you may not see them, but often there will be some telltale webs around parts of the roses. In that case, the cure is relatively easy. Use a stiff spray of water from your hose and give those roses a thorough shower, in particular spraying up underneath the leaves. Repeat this process one or more times every few days. After a week or so of such treatment, the spider mites should be gone (They hate water.).

Good luck.

Kate

If you have used other fertilizer in addition to the combo drench, it is probably fertilizer burn. Burning often involves a combination of fertilizer, insufficient water, and hot sun. Leaf surfaces exposed to full sunlight burn first, not the shaded lower leaves. Foliar sprays can contribute, but you aren't doing that.

The insecticide in the combo drench product does more harm than good and can encourage spider mites. In central TX, you probably don't need the fungicide during hot, dry weather. And the fertilizer is a cheap chemical fertilizer that is incorrectly balanced for roses.

Jackie