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spot anthracnose,
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Posted by
farmerduck NJ (
My Page) on
Tue, Aug 28, 12 at 22:09
| One of my roses got a case of spot anthracnose. It is the only one that has it, and grows in the same bed with nine other roses. I don't spray. Instead, I shovel prun the weaklings and only if they go completely naked(e.g., Europeana, Gingersnap). I planted a Pomponella Fairy Tale rose on multiflora stock this past spring. It might be because of my alkaline soil, the poor thing did not grow much in 5 month, has put out no more than 10 blooms so far and now I just realized that it is infected with spot anthracnose. I initially thought it is blackspot, and then realize it is probably SA as I found telltale signs of SA, such as the center of the brownish spots dropping of.
Should I shovel prune this one before it spread SA to my other roses? Should I learn to live with SA?
Most of my roses get some blackspot at this time of the year, which does not really bother the roses or me at all. But this is the first time any of my rose gets SA, which from what I can gather online, may be more harmful than blackspot.
Many thanks in advance,
Mark
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Follow-Up Postings:
RE: spot anthracnose,
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| Over the years I've noticed that many roses which are highly resistant to blackspot will get spot anthracnose late in the season. In my garden, the infection is not noticeable and really appears to do no harm at all. I ignore it. |
RE: spot anthracnose,
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| Mike -- This is exactly what I was hoping to hear. Thanks! |
RE: spot anthracnose,
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| The conditions for spot anthracnose seem to be fairly narrow. I have noticed in mainly in cool weather with rain. Most roses don't get it. I have seen it mainly on hardy roses such as There Bugnet and some of the Explorers. |
RE: spot anthracnose,
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| One thing I've noticed is that my Kordes roses, which are touted specifically as disease-resistant, do not display that trait until they are large and well-established. Every one of them has a bit of an issue in their first year in my garden, and I end up doubting myself for dubious choices. However, each of them also turns into a big, healthy shrub by the third year that I rarely or never need to spray. |
RE: spot anthracnose,
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- Posted by seil z6b MI (My Page) on
Wed, Aug 29, 12 at 12:24
| Michael, how do you diagnose the difference between black spot and anthracnose? I have a lot of spotting going on now and just assumed it was black spot but maybe it's not. |
RE: spot anthracnose,
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| On most varieties, blackspot spots have fringy margins. Cercospora and anthracnose spots are somewhat more reddish or purplish and have smoother, firmer margins. Both C and A spots develop a pale tan or ashy center with a purple rim. With anthracnose, on most varieties, the center eventually drops out, leaving a shothole with a purple rim. With cercospora, spots may merge to form a large dead area--this can take months. Varieties highly susceptible to anthracnose may have feathery purple smears along with the defined spots. With blackspot, you have more rapid yellowing and defoliation than with the other two. Cercospora is common in my garden. 'The Fairy' always has it, and many of the Buck roses. 'Knock Out' is moderately susceptible to cercospora. A plant of 'Pink Meidiland' here often has symptoms of all three diseases at the same time. |
RE: spot anthracnose,
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| I always have trouble distinguishing cercospora from anthracnose -- so that's helpful. :-) Jeri |
RE: spot anthracnose,
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| About five years ago, Jean of Tenn. posted some excellent pictures of common rose diseases - see link below: |
Here is a link that might be useful: Rose diseases, Jean of Tennessee
RE: spot anthracnose,
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- Posted by seil z6b MI (My Page) on
Wed, Aug 29, 12 at 15:41
| Thank you, Michael! I think from your descriptions I have some of each out there. Oh Joy! |
RE: spot anthracnose,
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| Thanks, Michael! I think a few of my roses might have Cercospora too. :( |
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