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lovepat906 Havre De Grace, MD Nov 10, 2016

My Zebrina Mallow went nuts this year! BUT! Now it is covered with something I do not recognize. Should I cut them all down and dispose? Any other treatment advised?

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Loretta_NJ (Zone 6b) Nov 10, 2016

It's rust. You can cut them down and don't add to your compost but I doubt you will get rid of it. Any mallow and hollyhock you grow will get it.
Do you want to spray? I used mancozeb once years ago successfully but I don't like to spray. There are other fungicides you might try. I don't believe simple clean ups will take care of this one but you can try and maybe try refreshing the mulch around the plant.

http://plantclinic.cornell.edu/factsheets/hollyhockust.pdf
https://wayne.ces.ncsu.edu/2013/05/to-fight-hollyhock-rust-break-disease-cycle/

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