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| I recently rated the Old Garden Roses I grow on their blackspot this year; my garden is no spray. Fantin Latour, Rose de Rescht and Variegata di Bologna have the worst cases, most others are blackspot free. See the blog: |
Here is a link that might be useful: Garden Musings blog on Blackspot in OGR's
Follow-Up Postings:
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| I only grow two of your roses, Coquette des Blanches and La France. Both of them are completely free of blackspot. In the case of La France, I wonder whether a warm, dry climate is not more to her liking. Mine is very young but every bloom produced has been glorious, no balling at all, in spite of the fact that I've encountered balling with some of my tea roses this year. It will be interesting to see what others have experienced with their old roses. Ingrid |
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| Thank you great report. I grow most of them. As usual my experience here in MD is a little different. By significant BS I mean more than 50% leaf loss. Semiplena is my clean alba. From your list: Olga |
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- Posted by jacqueline3 9CA (My Page) on Tue, Jun 19, 12 at 11:42
| I live in a warm & dry summer area, within 4 blocks of the downtown of a 50,000 pop town, and 4 blocks from the freeway. I note that because I have read that living in urban areas may diminish black spot because of the sulpher in the air. Anyway, I grow a lot of teas, noisettes, and chinas. None of them get much blackspot at all, although some of them do get some mildew. I also have maybe a half dozen old HTs - they all get blackspot to some degree, and a few of them also get rust - eeew! I only keep them because they are family heirlooms, having been planted by my husband's grandfather in the 1930s & 40s. So, I agree that the real old OGRs seem to be way more resistant to blackspot. Jackie |
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- Posted by professorroush 6A (My Page) on Tue, Jun 19, 12 at 13:18
| Great input everyone, especially Olga with her list. I wonder if it would be a useful exercise if we chose 5 or 10 very ommon OGR's and then made a list of how they performed in geographic areas by response from members here? |
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- Posted by carol6ma_7ari zones 6 %26 7a (My Page) on Tue, Jun 19, 12 at 14:15
| My roses are in coastal RI and my albas and musk and rugosas are OK. Worst of the others is Alberic Barbier. |
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| Of my mixed collection of modern HTs, OGRs and shrubs, only 4 roses have blackspot: Jacqueline du Pre (shrub), Blanche Moreaux (moss), and the two minis. All the modern HTs are clean. I only just made my first app of fungicide, primarily to keep the bs from spreading to the HTs from Jacqu and Blanche. So much for HTs being disease prone while OGRs and shrubs are resistant. La France gets horrible blackspot and botrytis here. I don't grow her for that reason. From Olga's list, of the ones I have experience with here in western Washington: Mme Hardy, pretty clean Regional reports and recommendations would be a good idea. |
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