Will Monterrey Complete Disease Control fix this?

[JScott]

This isn't about an orchid issue, so I considered in posting in the forum for completely off topic, but it is about a disease, and this could apply to orchids, so I posted here.

I have these roses that I've had no trouble with all year. Not a single blemish. Now I have two plants starting to show signs of disease. I googled, and couldn't find any pictures that looked exactly what i have, but maybe rust or powdery mildew or black spot? I just can't tell.

Anyway, I have plenty of Monterey Complete Disease Control on hand, so I sprayed them with that yesterday and drenched the soil. I'll spray again today and drench the soil again in another couple days. Do you think Monterey will work on these diseases?

They are both hybrid teas. One is Opening Night and the other is Desert Peace. It's the first year for both them, but they both have thick sturdy canes (and I also did an experiment. ES challenged the conventional wisdom that in warmer climates you should plant them with the graft union level with the soil, but he said that was BS. You should bury the graft union under any circumstances. So I planted Opening Night as I normally would, but I planted Desert Peace with the graft union below the surface of the soil. Opening Night did just fine; what I would expect form a first year tea rose, but omg Desert Peace... it just went wild. It looks like a second year rose, or even a third year rose. I have a bunch more ordered that will arrive in late February, and I'm going to plant them all with the graft union below the soil. Just a little side note there).

So you can take a look at the pictures and tell me what I have. I don't really care much what disease it is exactly; I just want to know how to treat it, and since Monterey is what I had on hand, that's what I used, and I want to know if that was an acceptable choice, or if I should try something different. It isn't bad yet. I think I've caught it early enough that I can easily wipe it out. Any thoughts?