What to do about rose bushes yellow leaves??

The best remedy for this one is to spray it with spray suitable for fungal diseases on roses. And ensure to keep your rose hydrated by deep watering every 3-5 days compared to light sprinklings of water. And also feed it during spring, summer and autumn with a specially blended rose fertilizer.

Here's a general guide for you to take care of your roses:

https://www.gardenguides.com/79062-causes-leaves-rose-bushes-turn-yellow.html

Here's a link with possible reasons for your yellow leaves:

https://www.gardenerreport.com/rose-leaves-turn-yellow/

Some yellowing of rose leaves is normal on the bush. Could you be getting the leaves wet when they are in the sun? Are they getting wet in the dark and staying wet? I've found spraying pretty much everybody in the garden with Neem Oil is helpful. You can find it in nurseries, Home Depot, and cheaper online. Dilute as instructed and use a hand pump to spray affected plants. It takes care of powdery mildew (which your rose might be developing), pests such as aphids (they love roses!), and other fungal diseases of plants.

Egg shells in soil...no over watering cut back anything damaged watch for the knuckles on it cut above them always

Soapy water kills aphids

It is normally a sign of heat stress. Here's a good article on the subject:

https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm

Often yellowing leaves on plants is a sign of over watering. In roses, that too could be the problem as well as perhaps a lack of iron in the soil. Roses don't take a great deal of water.

This link could be helpful.

https://cals.arizona.edu/extension/ornamentalhort/plantprotect/diagnoroseproblems.pdf

I would go to your local gardening store and get fertilizer that is great for roses. Ask the employees and they should be able to help find the right one.

This video explains why rose bushes leaves may turn yellow: https://www.youtube.com/watch?v=1tAI8HzPlXA

Here is a site that will give you a few helping tips

https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm

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Neem Oil is a good all round fungicide and Safer makes a gentle but effective spray also.