Yellow tiny spots taking over rose leaves

Toni, it looks like the very early beginnings of black spot. It can be controlled (and prevented, but not cured) by a milk solution. Powdered milk, 2%, whole milk, whatever you have on hand, diluted 50/50 with tepid water and sprayed on the plant will either stop the spread or prevent black spot.
My Belinda's Dream is very prone to black spot, and I start spraying her now and weekly throughout the growing season.
Some roses are more prone to black spot than others, so it's nothing you did or didn't do to cause it.

 

Yes, removing the spotted leaves will help, but be sure to dispose of them in the trash, not the compost heap! Go ahead and spray--just because the meterologists SAY it's going to rain, doesn't mean it WILL rain! You can re-spray as often as you like since the only thing the milk spray hurts is the fungus. Also spray as early in the morning as you can so you don't get sunscald on the leaves.

 

I am not sure, but it is the lactose that is the active ingredient. If buttermilk has lactose, and I think it does, give it a try!
Who knew gardening required a degree in chemistry!
We have sunny skies and only 10% chance of rain until Thursday, when the chances get better. Of course, that's what the meteorologists say . . . .

 

Marlingardner, thank you so much for knowing about this. I was just about to post the almost exact pictures and question as Toni, have the same problem. I have been picking the leaves off and putting them in the trash. Should I also wash my gloves? Maybe get some just for my Roses ?
Toni, some rain is coming your way, we had some yesterday and 45mph or more winds. Turned cold again too.Getting more in a couple of days. Maybe enough to make a difference and wont have to water.

 

Happyzinnia, I don't think washing your gloves or having gloves dedicated to roses is necessary. Any transferrence of the fungus will be taken care of by the milk/water spray.
I did a little more research and found that some folks use hydrogen peroxide instead of milk, and also add a small bit of vegetable oil to make the spray stick on the leaves better. I haven't tried this, so can't recommend it.
I do hope this helps your roses!

 

I think the rose is deficent burn infected leaves, feed with a liquid feed then hoe in a slow release fertiliser and mulch.

 

Greetings from the beautiful Rhein Valley in Germany. This is an extremely old thread, so what I am about to post may not be read or useful to the people who originally discussed the problem (above). Nonetheless, I did want to comment. With all due respect to marlingardener, I can't agree that this is the beginnings of blackspot. I have about 3 dozen roses bushes and the fungus I know to be blackspot looks nothing like this picture, not even in its beginning stages. I do believe I have found the real culprit. Please go to the link I am posting, scroll down and see the picture and commentary on hoppers and leaf hoppers. I have this same problem on a couple of roses and I definitely have leaf hoppers. It wasn't until now, however, that I knew they were the culprits. You should be able to treat with neem oil, which is not harmful to pollinators because they do not eat leaves. However, be sure to spray in the morning or evening when pollinators are least active, so it does not land on them.

http://www.missouribotanicalgarden....ardening Help/Visual Guides/Rose Problems.pdf

 

Hello and welcome to garden stew I think your obsevation may be a good one.

 

This is not black spot--I am dealing with the same issue and I think it is rose rust https://www.gardenersworld.com/how-to/solve-problems/rose-rust/. Try copper fungicide.