Hello and thank you for contacting Ask Extension. I have a few questions for you. What type of rose are they? Floribunda, hybrid tea, or what? What side of the house are they located at? How much sun? Have they been fertilized? and have you ever pruned them? Once I have answers to these questions, I should be able to give you an answer to your question. Could you also send a picture that includes all 3 roses in the same frame? 

Rachel, I am sorry, but i do not see any responses. Could you check and resubmit your answers to the questions.

Thank you

Hi Diane,

Here are my responses, they are underlined:

Hello and thank you for contacting Ask Extension. I have a few questions for you. What type of rose are they? Floribunda, hybrid tea, or what? I believe they are knockout roses. What side of the house are they located at? They are located on the south side of the house How much sun? They get sun until about 3 pm Have they been fertilized? I’ve used Preen on them in the past, but I haven’t been consistent with it. and have you ever pruned them? Yes, I’ve had all 3 of them for 7 years now and they’ve been pruned each spring, but they continue to look like this (I think this is the worst they’ve looked though) Once I have answers to these questions, I should be able to give you an answer to your question. Could you also send a picture that includes all 3 roses in the same frame? They are all in different locations, so I could try to get a farther away picture if you’d like. I’m not sure how helpful a far away picture would be though. Let me know and I can do that!

Thank you Rachel for sending the information. I do not believe I need a picture of all 3 if they are not together. I believe part of the problem is that you are using Preen on them. Preen is a pre-emergent weed preventer, not a fertilizer. Generally, roses need a higher percentage of phosphorus (the second number on the bag) than nitrogen and potassium (first and third numbers, respectively). Therefore, analyses such as 5-10-5, 4-8-4, or 4-12-4 are good maintenance fertilization for roses. If you are unable to find fertilizers with these or similar analyses, a 1-1-1 ratio such as 8-8-8 or 12-12-12 may be used. 

You should prune out all diseased canes, which are the ones that have spots and brown areas on them. This is really going to open up the roses to get better air flow through them to keep diseases at bay. I would go ahead and prune all of the other canes down to about 8-10 inches from the ground. When pruning,, use clean, sharp tools and disinfect them between cuts to prevent the spread of diseases. Pruning should be done to open up the plant, allowing for increased airflow and reducing disease incidence.
Then fertilize according the instructions on the package. 

I have included several publications for your reference.

https://extension.missouri.edu/publications/g6601

https://www.michigangardener.com/how-to-grow-great-roses-pruning-and-fertilizing/

https://www.washtenaw.org/DocumentCenter/View/16653/Autumn-Rose-Care

The brown and yellowish brown canes, I would cut them back because they are dead. The rest I would cut back to the 8-10". Rose 1 will be sparse, but i believe with fertilizing and cutting them back, it will fill in. If you begin to get dark spots on the canes or flowers, you can dust with a product that has sulfur or triforine in it. These are fungal spots and can cause a lot of problems with roses.