I've not seen a lot of powdery mildew on roses, but a good product for controling all your problems is neem oil. I can't remember the brand names, but I think Green Light makes one, and several other companies. If you don't see one labeled Neem Oil on the shelf, it's sometimes called fungicide plus or something like that. Neem is very effective for fungus and it's an insecticide as well. I've found that black spot is very difficult to control. When it shows up, you have to spray repeatedly, and try to never let water hit the leaves when you water.
Is there anything you can do to increase the air circulation or get more light on the plant?

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Dave
Even my growlights are getting restless!

Claire,
Can I ask the dirt/growing conditons the rose is in??

And what kind of fertilizer you've used, if any???

And instead of trimming it next time, *which in turn encourages new green growth~which in turn also attracks aphids*, just pick off the effected leaves of the black spot, pull all of the dead leaves that have dropped, and pull the dirt away from the bottom of the plant and give it some air circulation..

Limit your fertilizers, especially with a high first number, same for any bagged dirt/soil/potting soil that has alot of nitrogen in it, that cause's fast lush green growth also attracking aphids...
(~~~>when a plant isn't in it's right growing conditions or too much of something, it'll send out signals to bugs, saying "Somethings' not right with me, come eat me..")

Stick with the Organic fert's, slow releasing, such as greensand...*Obywan/Terry likes this product alot..* or bone meal, blood meal, fish emulsion as a foliar spray...

And another question, how did you plant the rose?
Did it come bare root, or bagged in soil?
And how did you prepare the hole for planting?

Just curious??

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Weezie

Don't forget to be kind to strangers. For some who have
done this have entertained angels without realizing it.
- Bible - Hebrews 13:2





http://photobucket.com/albums/y250/weezie13/

Let me say I am not a rose expert. I have only managed to keep three alive snd healthy.

For blackspot I read to put down cornmeal mutten I do not know if that is the way it is spelled. Anyway, we had a rainy season and I took regular cornmeal and sprinkled in the soil around and on the leaves and it cleared up.

I fertilize with time release Byers and handful of empsom salt sprinkled around the bush in Spring. A bananna every now and then buried. Some sour milk in the spring and fall.

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http://www.flickr.com/photos/audwoman/

If you want the rainbow you have to put up with the rain!!

I use Bioganic which has Neem in it. It is all organic spray gets aphids white bugsd etc. Good for fungus I bougght mine at Calloways Nursery here. It is by Greenligth think might be what Dave is thinking of. Also use Epsom on the roots I use bllod and bone meal on my roses as well as rose food. Also spray fish emulsion spray. Spray liguid Molass' which I mix crushed garlic and cayene pepper have had good results. When you pick your infected leaves make sure you get them all as if not you will reinfect the plants through the soil. I put mine in the trash to make sure they don't make it back to the soil. Hope this helps you it is just what I do.
Jimmy

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Meet Clyde my Male Sugar Glider. Clyde says.
Keep it organic
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