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If the temps are in the high 90's to 100's where you are the rosebushes could be just taking a break to gain strength back. Heat stress will do this. Sometimes they do take a break between bloom cycles to regain strength. If you have not fertilized them at all or it has been a month or more, then yes fertilize them now. Make sure the soils moisture is good before and after feeding them as well.

Stan the Roseman
Consulting Rosarian

Try neem oil. Very effective and not harmful to people or animals. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

These articles should help: https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-winter-care.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/mounding-roses.htm

The Knock Out roses are also known as a "Self-Cleaning" rose bush in that they drop all their petals and send out new blooms without having to prune them to bring on the new blooms. Usually they will have buds coming on strong for another cycle of blooms once the old blooms have fallen off. If it has been real hot where you are or even windy, they might need some watering. Keep an eye on the soil moisture and perhaps give them a foliar feeding with some Miracle Gro to give them a boost. The blooms should return in grand fashion soon.

The Knockout roses do well just about anywhere. They are hardy and love lots of sun. Here are a couple links for you about the Knockout rosebushes:

https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm

https://www.gardeningknowhow.com/ornamental/flowers/roses/self-cleaning-roses.htm

It is hard to say without actually seeing a picture. The holes could be insect damage and the greyish white spots could be the insects if they move. Otherwise it may be a bit of a fungus infection. Spraying with an insecticide of your choice should take care of the insect damage. Be sure to spray up under the foliage too as some insects like to hide underneath the leaves and thus dodge the insect sprays while they continue to do damage. The red to maroon colored leaves are new growth. They will turn green as they mature. Along with that new growth will come more buds for more blooms! That is a good thing indeed!! Oh yes, for the greyish white spots if it is a fungus of some sort, spray the rosebushes down with a fungicide. My favorite and earth friendly fungicide is called Green Cure. It is available on line and at some garden centers and nurseries.