Please forgive the massive writing errors. English is not my second language but it must be auto-correct's, lol.

Jacquiline, I was thinking about cutting everything back to trigger new growth, but I'm afraid that it might stress the plants further and spiral them into major die-back. The up side is that with all the rain I think a lot of the spray has washed off.

If I did that here I'd probably just let them alone besides watering if needed and let them releaf when there ready...

That doesn't look like burn to me. Some of it, not all, appears to be fungal.

"The poison is in the dose." Maybe up to 1 TB/gal of 20-20-20 would be OK if it is dissolved evenly. How much did you use?

I agree that you should just water appropriately and be patient.

I put in a cup of 20-20-20...(look down, kick a rock, and SMH)...

I've had instances where the treatment for blackspot causes the infected leaves to yellow and fall off, but never to this extent and never on seemingly uninfected petals.

Severe shock can look like this followed by sudden and massive leaf drop. The whole plant may have been shocked not just the leaves . Water deeply a couple of times and then do nothing but water regularly. Never ever use a fertilizer not intented for foliar applications to spray. And the required dilution when spraying is lower than what you would use when soil drenching even with a fertilizer good for spraying. When spraying a fertilizer always use the minimum droplet size allowed by your sprayer.

Yes, after hearing about the dose, I agree that it could be systemic shock rather than foliar burn that might have resulted from 1/16 of that dose.

Live and learn, kubla.

"Systemic Shock" WTH?!? Are my roses goners?

No, not necessarily. They just need time to recoup. Just keep them well watered and I would definitely NOT prune them back. Since most of the yellowed leaves seem to be lower down you don't want to take off any of the green ones at the top. They need those to continue to feed the plant while it rejuvenates. Just clean up any of the dropped and all yellow ones and maybe take off any buds so the plants can store more energy for leaf production. Don't feel too bad. I think all of us have burned our roses at least once. It's a learning experience.

Kubla, this happened to me recently. I didnt spray them or fertilize or anything, but three of my roses suddenly did this exact thing. They just suddenly turned yellow on the lower half of the plant and fell off. It was not after spraying or after applying anything, they just suddenly (from one day to the next it seemed) turned very and completely yellow, and fell off. (took about a week before they all fell off).

The ones that were affected were Peach Drift, First Crush and to a lesser degree Summer Romance.

I originally thought it was caused by lack of water/intense heat combo because my First Crush (still in its nursery pot) was dry as a bone one day when I got home from work. It was a little wilted but not much, but soil was very dry to the touch. I watered it well and it bounced right back, but the leaves started to yellow the next few days.

I couldn't tell what had caused it on my Peach Drift, but it too was in a somewhat dry spot (in the ground) and after a few days with no rain, did the same thing. I cant really be sure if that's the cause, because we had gone many days without rain the past and it never did this, but maybe the summer heat added to a few days with no rain was too much for it.

At first I thought it was maybe black spot, but its definitely not that. The leaves are all pure yellow, no black spots at all and no green either. Just turned pure yellow and fell right off.

The good news is that they seemed to shrug it off and just continued growing. Except for my poor Peach Drift which I decided to move and now seems to be turning black from the bottom up :(

I'm rather clueless as to what is really causing it, but I'm pretty much going to assume it was intense heat/lack of water and continue to care for them like I usually do.

Kub, I'm not sure where you're located, but I have learned myself not to mix the fertilizer and whatever chemicals just in case there might be some unforeseen reaction. Also, sometimes too much water causes this in a particular plant. It doesn't look like you have a dry problem?

What I would do to diagnose is to not water, let it get dry (if possible), and then water deeply. Cut the damaged parts and watch what bounces back, moving them to semi-shade as they recover. I would actually retain as much of the green leaves as possible and not do a cut back, but definitely remove the offending leaves so you can monitor the health of the plants.

I had a plant, Distant Drums, completely defoliate on me and I moved him to a place with a little less sun and watered deeply and not often.

Good luck.

SoFL- I've done the dry pot thing with the same result. One of the two Grace De Monacos on Fortuniana that I had suddenly turned yellow because it was in a corner of the yard that wasn't getting enough water. I babied it with deadly results. I also had a Ruby Ice, this one on Dr. Huey, that the same thing happened to and I was able to revive it. This is the draw-back to growing roses in pots.

At first I thought it was an overwatering issue, since my sprinklers go off six days out of the week, but the soil drench of the different roses varied in how much water each had in the pot. As time has passed many of the roses are displaying the browning leaves that are indicative of chemical burn, but some just have dropped all the yellow leaves.

I'm writing it off as an honorary mention of the Dummass & Dummerass award in the area of garden genocide. I haven't lost any roses yet, but time will communicate that clearly.

Okay, MsDorkGirl, you need to share your name/nickname because I'm afraid of insulting you with your screen name, lol. Thanks for the feedback/advice. It had been a long time since I had mixed fertilizer and chemicals in the same sprayer. I did it to try to kill two birds with one stone and try to give the infected roses a boost. I'll make sure to never make that mistake again! I usually baby my sick roses like you say, but I have a yard full of roses in this condition right now. Again, thank you for the advice and thank you for the luck. I'll need it!