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| Hi All, Cannot get rid of the b/s on this rose and it seems to get worse every year. Can anyone tell me how to go about getting past this? I spray b/4 bloom, after bloom, don't water them from the top (can't do much about the rain :-) Keep the bad leaves picked up and off. Would replacing the top soil and mulch help? There is a landscape cloth under the mulch. Should that be removed? I know that the spore is air born. Something I can amend the soil with? I'm afraid I'll have to take them out and replace with something else but then would a new rose be susceptible? We had a really hard winter last year, but don't know if that makes a difference. Know that's a lot of questions, but any help at all would be appreciated. |
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| Blackspot is not airborne to any significant extent. It carries over mainly within the bark of canes and to a lesser extent in fallen leaves (Compendium of Rose Diseases). Landscape cloth would have no effect on disease, but I think every experienced gardener here would say it is useless and troublesome in the long run. Mulch rots on top and the resulting soil supports weed growth. 'Carefree Beauty' is BS-resistant in many gardens, but apparently you have a race of BS that affects it. Frankly, your choices are to live with it, try a different variety of rose, or spray fungicide every two or three weeks. |
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| A little more information might help. What do you use to spray for BS? How often? Do you use Bayer Garden Disease Control for Roses, Flowers, and Shrubs (and I mean that exact name--not one of the other Bayer products)? Are you sure you are not looking at old blackspots which were killed by a previous spray? The spots will not disappear even though you have destroyed the fungus called blackspot. However, the new leaves should come in with no spots on them. Do you have this problem all growing season? Or just at certain times--maybe spring and fall? Kate |
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