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| Just noticed this today on Dream Come True. Half her leaves are this way. She is surrounded by other roses that don't (yet) have this. Please advise on what it is and what to do about it. Thanks!
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Follow-Up Postings:
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| Ok - a little googling told me it's Rust. And in looking closer, a handful of surrounding roses are infected. So - advice on how to handle! Thanks for any help. |
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- Posted by kstrong 10 So Cal (kathystrong@gmail.com) on Sun, Apr 15, 12 at 14:36
| Yep, that's rust. And no surprise, either, because this is the heighth of rust season -- cool and damp. You can't "fix" rust. What you do is remove it and try to not shake the spores around on the way to the green bin. When I have a plant that has it bad, I severely prune it and then resolve to do better with my spraying when the new growth comes. But if you have the time, it works just as well to sit there and pick all the diseased leaves off and then spray the canes as the new leaves come out. But you MUST get rid of the infected leaves NOW -- if you leave them around, you will have rust on everything, all year. Most fungicides will work -- although I have noticed that Compass is singularly not effective on rust. Kathy |
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| be careful with watering too - don't spray any water on the foliage. There is no cure for rust, only possible preventatives which, if you are going to keep this cultivar, you may consider using. Kathy is quite right, you need to remove as much infected foliage as you can. |
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| DO remove the infected leaves. I will wash roses well, and make very sure the plant is getting enough water -- too little water may equal rust. And, of course, you can spray. I really, really detest rust. Jeri |
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- Posted by jacqueline3 9CA (My Page) on Sun, Apr 15, 12 at 17:14
| I knew we had rust here in CA, but I did not know it was also in the UK. It does not seem to be in the MidWest or East Coast much - I don't know about the US South. Does anyone know why? Jackie |
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| In my 3rd rose year, this is the first year I've had rust. No one around me has roses - wondering if I brought in an infected new rose, or just weather / suseptability related? I'm not adverse to spraying, I just haven't had to yet. I'll remove all the foliage I can find with rust on it. Dream Come True is the worse - the others seem fairly minor. If she does same next year, she can go bye bye. So - I seem to see - wash with water, don't spray with water here. Which is preferable after removing the infected leaves? (They have plenty of ground water). I'm wondering if I may have brought this on myself as this is the first year I've done watering via sprinklers, then we got hit with an unusual amount of late season rain. Then - since I do have this, would be interested in recommendations of spray versus don't spray of fungicide. If I do decide to, seems like I've read lots of good things about Bayer products (which I'd use without insecticide). |
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- Posted by kstrong 10 So Cal (kathystrong@gmail.com) on Sun, Apr 15, 12 at 18:22
| I would skip spraying the leaves with water. If you have plenty of groundwater, just leave it at that. What Jeri is referring to, I think, is that stressed plants are in general more prone to disease -- all diseases. So if your plant is not getting enough water or enough sun, that is where you will see disease soonest. For rust, you want to keep the leaves dry whenever the temps are between about 55 and 65, including at night. So if it's a hot day and the leaves will dry completely before the evening temps set in, then you are fine to wash the foliage. However, if the foliage stays wet going into the evening and especially at night, you are not helping yourself. |
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- Posted by cupshaped_roses (My Page) on Sun, Apr 15, 12 at 18:29
| Some roses can stay clean for years and suddenly (usually when having a rainy season - some roses will start getting rust. It is very important to watch roses that are susceptiple to rust and remove all leaves with just tiny orange specks - sometimes even some canes develop a rust spot - and needs to be removed. I spray cultivars that are prone to rust - preventively with Systhane fungus fighter (Myclobutanil) since it seems to work better than the other Bayer disease control sytemic fungicide (Tebuconazole) - and spray roses every 14 days - changing between the 2. But roses that need more spraying than I am willing to do - will have to go. It is possible to find roses that are doing well and stay pretty healthy - no matter where we live. Eventually we learn over the years, what roses do well in our area/climate - no spray or little spray if we do choose to spray some of the roses we grow. That is what I choose. I do find rust is harder to control than BS or PM. |
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| When removing the rust covered leaves, I tried to be really careful - putting the garbage container directly beneath each one I removed, and working slowly - but that danged orange powder still went everywhere. Somewhat tempted to wash that down! Supposed to be in the 70's today. |
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| Do yourself a huge favor and remove any roses that rust badly/early, because there is a good chance these will always be varieties that you will struggle to keep healthy. |
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- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Mon, Apr 16, 12 at 15:16
| I found suggestions to use anti-transpirants to protect against rust, but I did not find any scientific studies on the subject. |
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| Henry -- I've tried it, and it didn't do much for me. I do think it's helpful with powdery mildew, but questionable, with rust. Honestly, OTHER than spraying (and there are some very effective chemicals) I don't know anything that really prevents rust. I won't fight it anymore. If a rose rusts chronically, I don't want it here. I don't even want to contemplate a CLIMBER covered with rust! I urge you to follow Trospero's advice. It's just not worth the battle you'll have to fight. Jeri |
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| I would say so too - rust is a nasty disfiguring disease and it will spread throughout a garden. Even removing infected foliage, as you discovered, Harmony, the spores do tend to get about. Only if the rose in question was a real favourite would I consider keeping it. It is not absolutely inevitable that the rose will always be affected but I would need a really good reason to keep a rust-prone rose. |
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