Here is photo of cane.

Trying again

Left vs right

I handle it like Melissa. If it is fatal, you will eventually find out. I had one Lamarque a couple of years ago get what must have been downy mildew and I did have to take it out as it was circling the drain, sadly. My replacement Atmore Lamarque is doing great in a different location.

me three ^^^

I wonder what Ann Chase would say ( aside from ‘culture it’).

Is no one here able to induce her to comment, on occasion?

I wish I could see it more clearly. It's not sharp enough to diagnose. Spots on the cane COULD be downy mildew and on the leaves, too. But I'd have to see it more clearly.

I think I'd remove the worst of the leaves and discard them.

One thing that can suppress Downy Mildew (if in fact it's that) is dressing with fresh horse manure to build up a healthy bacterial colony. But I don't think this plant is mature enough for that.

Is it possible to get clear, sharp images of those leaves?

Thank you for your help! These photos are clear, maybe you can click to enlarge if they still look blurry?

Totoro, some of my roses this year has spots on canes after pruning. Most of them are brownish but i also noticed silver colour spots. I ignored it thinking perhaps it is a sign of maturity but you got me thinking now. I hope it is nothing when it comes to canes but there is an interesting article on ARS about downy mildew may/june page 82.

It says:Signs (physical presence of pathogen) are sparse and hard to see with d.m. Look for faint,white patches limited by veins on the back of leaflets.

Your last pic looks very much like this pic on mag.

I have no idea why my pic turn sideways.

I hope this helps. But i am so curious about the canes.

The leaves looks like downy mildew, which is more frequent in coastal California - where I live. However, when the condition is right, it can occur anywhere. The cane is probably affected by DM too, though I cannot see properly. Are the spots on the cane sort of brownish/reddish?

I had an outbreak of DM about 2 years ago in my garden. At that time I planted 9 Livin' Easy roses which were badly affected. From them it spreads to other roses in the garden. Fortunately the Livin' Easy roses survived.

I think Jerijen is right; horse manure probably is the best. Though it has not be subjected to rigorously evaluation, it is probably the micro-bacteria in the fresh horse manure that helped in the control of the disease. Either they strength the plant or compete for growth of the DM (DM is technically not a fungus - it is a protozoa). However, for those of us living in a city without access to a farm, or have lots of affected roses, it is hard to gain access to enough fresh horse manure. Also it needs to be fresh manure and not composted manure. For very young roses, there is a theoretical risk (real??) of burning roots.

Last year I noticed a positive correlation with using a liquid mixture of live bacteria, which is part of a treatment for hard clay soil and control of DM. It is in one of the bottle of John and Bob's hard clay soil treatment called Penetrate. However, it could also be that the roses are becoming more mature and could better weather the DM themselves.

If you live in the mid-west, DM is probably temporary due to wet weather. If that's the only plant affected, I will probably suggest removing all the leafs and see what happened. DM will disappear when the temperature gets above 85 degree F because the spores are killed at high temperature. There are sprays but they are all expensive. The most used is probably Aliette which is sold on Rosemania. It is actually quite effective, but you probably don't need it because unless you live in coastal California (or west coast in general), it is probably a limited problem.

OK. NOW I can see. Yes. That definitely looks like downy mildew. And yes, very wet conditions foster this problem.

When it first showed up here, long ago, we did try Aliette. As noted, it is pricey. Moreover, it melted the surface of a plastic measuring spoon, which led me to say NO. No way in Hell were we using that!

An avocado rancher suggested that we try mulching around the plants ... OUT a few inches from the stem, and out to the drip line, with FRESH horse manure. That's what they were using to treat their trees for avocado root rot, which is a related fungus. We did, and it worked.

But an immature plant like that in a pot? I don't think you can use that. But anything else that might help build a healthy bacterial colony in the soil might be helpful.

And, as others have noted -- not knowing where you are located, and what your weather conditions have been, it may be that a change in the weather will take care of the problem.

Plumeria girl, those were excellent pictures and really showed the affect on the leaf reverse. Thank you. I always forget the "limited by veins" attribute.

Thanks so much everyone. What a bummer.

I don't have access to fresh horse manure. I will remove affected leaves see if the warm weather kills it. It has been unusually cold for spring. Do you think I should cut out the affected cane too?

I suppose I should quarantine this plant at the very least.

Quarantine?

As rose lai and jj have made the Dx: isolate

I learned this from Arthur , on PBS Kids.

Totoro ... I am told that infected leaves blowing through the garden can spread the fungus, so since you CAN move it, maybe you should.

And I hope you get some warmer, dryer weather.