black spot - Knowledgebase Question

Hicksville, Ne
Question by oohlala418
June 13, 2009
My rose bush is 19 yr old.
It is a climbing bush.
the last 3 years it has been getting yellow leaves with black spots on them then thebush is almot bear. can you tell me why and how to take care of it. Could it be from surounding bushes.I really dont want to loose it
thank you


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Answer from NGA
June 13, 2009

0

The symptoms of black spot begin with circular black spots, frequently with fringed margins. Yellowing and defoliation are common in susceptible cultivars. In wet weather, spots may become very severe and run together, making large irregular spots. Control practices include avoiding dense plantings (good air circulation all around the plant is important). Avoid overhead watering. Rake up and remove all leaves at the end of the season. You can try removing the yellowing leaves as soon as you notice them, but I suspect the canes might also be infected. A copper-based fungicide should stop the disease in its tracks. If you use a preventative spray in May and June, your rose should not develop black spot in July. Try putting your rose on a regularly scheduled spray schedule. Best wishes with your roses.

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