Rose plant - Knowledgebase Question

Hamilton, Ne
Question by cava11650
July 2, 2009
My rose bush leaves are getting yellow and brown and falling, the buds are getting black and brown and are not opening I love my roses and I dont know what is causing this. Please help.


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Answer from NGA
July 2, 2009

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What you describe sounds like a disease called black spot. 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. Rose Defense is a good product. 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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