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| "Many popular varieties have been noted exhibiting symptoms of the disease with apparent susceptibility ranging from very susceptible (plants die in one to two seasons) through resistant (plants exhibit symptoms but live for several years) to apparently immune. In field trials conducted by MDA, ‘Flower Carpet” varieties have proven to be very susceptible, Meidland cultivars, including ‘Alba’ are moderately susceptible and the native species of roses; Rosa setigera, R. virginiana, and R. palustris and the naturalized R. rugosa seem to be very resistant to possibly immune to the disease. There are reports from the landscape and nursery trade in Maryland that other rose cultivars and species affected include, in no particular order: ‘Knockout’ , ‘Tamora’, ‘Zephrine Drouhin’ , ‘Collette’, ‘Snowbush’, ‘Kew Rambler’, ‘New Dawn’, ’Daybreak’, ‘Carmenetta ‘, ‘Clymenestra’, ‘Alexander Girault’, ‘America’, ‘William R. Smith’, ‘Zitkala’, ‘American Pillar’, ‘Snow Dwarf’, ‘Edmund Proust’, ‘Easlea’s Golden Rambler’, ‘Mrs. F.W. Flight’, ‘Edith Ballenden’, ‘Walsh Rambler’, ‘Madam Alfred Carriere’, and Rosa wichuriana hybrids."
H. Kuska comment, please note: (MDA) is Maryland Department of Agriculture |
Here is a link that might be useful: July 6, 2011 Maryland Department of Agriculture (MDA)
Follow-Up Postings:
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- Posted by grandmothers_rose z6b VA (My Page) on Sat, Jun 23, 12 at 7:56
| That settles it. No Flower Carpet roses for me. |
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| Some degree of resistance, allowing the plant to live longer, just means that plant is a more efficient reservoir and transmitter of the disease. So I don't think this finding should scare anyone away from Flower Carpet. There is no indication here as to whether the resistant species are carriers or not. But if many species are resistant, obviously there's a chance of breeding resistant garden roses. The history part of this article seems faulty. As I understand, RRD is probably indigenous to North America. The acute problem began when people in the ag school at Iowa State took it from the California mountains and spread it to the multiflora population on the Great Plains. |
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- Posted by mike_rivers z5 MI (My Page) on Sat, Jun 23, 12 at 11:06
| MichaelG, you might add to your last sentence concerning Iowa State's role in RRD: ...The acute problem began when people in the ag school at Iowa State took it from the California mountains and spread it to the multiflora population on the great plains. The large population of multiflora, itself, was a result of the widespread promotion of multiflora as a "living fence" by the same ag school. |
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