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Hollyhock Double Red with Rust

02 May 2012
Storms 29°C / 84°F

Hollyhock has what look like eggs on some of the leaves. Can someone ID the dots and what to do about them?

I did some research and discovered it to be a rust defect that is common to Hollyhocks: http://learningstore.uwex.edu/assets/pdfs/A2613.PDF

Is there a way to prevent the problem from occurring?


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Here’s what I’ve read – remove the leaves with the rust on them and in the fall make sure none of the rusty leaves or stalks are left on the soil. (I wouldn’t compost them, either) I have also had luck with shaking cornmeal over the plants when they emerge. It doesn’t get rid of it all (I’m not a neat enough gardener) but it helps. According to another folia member, the cornmeal works because of stuff farmers spray on their corn, so it’s not strictly organic, so you’ll have to make up your own mind about that. If your plants have gotten tall, you can also make a spray by soaking the cornmeal in water and using that water.

Posted on 03 May 12 (about 3 years ago)

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