Studio City, Ca
|My potted rose bush has yellow spots on the top of the leafs and a yellow powder on the underside. How do I treat it? It is spreading.
|Answer from NGA
May 6, 2012
|It sounds as though your rose has developed a fungal disease called rust. You can use a fungicide such as Funginex (applied according to directions) to help control the disease. If there are not too many affected leaves you can remove them from the plant (to keep the powdery spores from blowing or splashing onto healthy leaves). Roses are more prone to developing fungal diseases if they don't get enough sunshine or if they are overcrowded and air circulation is poor. Make sure you rose gets at least 8 hours of full sunshine each day and that you prune each spring to open up the center of the plant to better air circulation. Try to keep water off the leaves of your plant and be sure to fertilize it regularly so it becomes strong and healthy. Best wishes with your rose.
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