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Fri, Aug 17, 12 at 16:44
| Hi all--
My climbing rose has several canes on which the leaves have curled and appear to be sort of a silvery grey-green rather than deep green. The leaves look like they have a fine white powder on them but, other than being curled up, there aren't any holes or other signs of insects. I've checked for pests and nests but haven't found any. I'm thinking this is powdery mildew but I associate mildew with dampness and though I've watered fairly consistently, we're in a drought. What should I do? I'll try to post a photo but I'm not seeing a way to do that.... |
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- Posted by amberroses 10a-Pinellas Co.FL (My Page) on Fri, Aug 17, 12 at 17:31
| It looks like powdery mildew. Maybe the air is humid? We don't get powdery mildew much here, but I do get lots of blackspot in the spring even when it doesn't rain and the ground is as dry as a bone. |
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- Posted by amberroses 10a-Pinellas Co.FL (My Page) on Fri, Aug 17, 12 at 17:35
| Oh, I see powdery mildew thrives during dry hot days and wet cool nights. That would explain your problem and why I never see it because we so rarely have that combo here. |
Here is a link that might be useful: Powdery Mildew of Roses
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| Gret, that's mildew. Weather can induce it when conditions are right. Water stress, even when conditions are NOT conducive to the fungus germinating, can induce roses to mildew. Depending upon the rose and how severe the stress is, you can also force some roses to rust, even when nothing else is rusty. Personally, I would ignore it. Once things get back to normal (?), you either will have no issues with it, or you can get back to whatever you normally do to battle it. All you can do in these weather extremes many of us are enduring, is keep it watered. Don't cut it as it needs all the foliage to shade it and produce food. It needs all the canes to produce the foliage for food production and to be able to draw stored nutrients from. Don't spray because just about anything you use during drought, brilliant sun and high heat is going to damage the foliage, or worse. If conditions are really extreme, I wouldn't even suggest feeding anything, just keep it watered properly for your soil type and drainage. If and when things improve, you can get back to your normal practices safely. Good luck! Kim |
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