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This link said BlackSpot/Powdery Mildew. Are these different? I have black spots & yellow leaves on nearly every rose I plant in my garden but I don't have anything that looks like the powdery mildew description. Where can I find the best help for getting rid of Black Spot? My Hybrid Teas only last a maximum of 3 years before they succumb to this disease, it eventually ruins the canes and rots the root-stock. Thanks.