Knockout Roses Witches broom
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Knockout roses are mentioned in this article which gives a lot of info on the problem.
https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-rosette-disease.htm
It will spread to all roses in the vicinity. I lost my knock out roses and several mini roses and a climbing rose to this disease. They were all in the back yard.Thefoses in front so far are ok.
The problem is most likely in your soil.Before planting anything else it would be best to take the soil for testing.
Spray them with soapy water--a little dishwashing liquid and water in a spray bottle usually does the trick.
I don't see witches broom in the photo. I think it's something else In the soil.
I know that voles love Knock-Out roses! Out of 8 we planted, we are down to 4 now. If you see holes in the ground near your plants, this might be the problem.
I don't see witches broom in the photos you posted. It usually appears as red, thin branches that feel weak to the touch. If you do get WB on a plant there is NO cure as yet. Dispose of the plant asap and do not compost the remains; bag the remains in plastic, rake up all the leaves and bag them as well. Treat WB like the highly contagious disease it is. I lost 4 of my 7 Knock Outs to this horrible disease, so sad. The local agricultural agent said it was spread from the wild roses in the area, a disease it is. I lost 4 of my 7 Knock Outs to this horrible disease, so sad. The local agricultural agent said it was spread from the wild roses in the area, a wind borne disease, and nothing much can be done to protect your plants from it. Sorry for your loss of plants but it doesn't appear to be Witches Broom.
Perhaps the bushes died because they over-heated as a result of being so close to the brick wall. The wall heats up and reflects that heat to the shurb. I do not see anything wrong in the photo. We had a Knock-Out rose bush send up stems from below the graft. The stems took over... they did not bloom but kept growing. We had to take the bush out.
Maybe, but the other four are fine.