Rose Black Spots - Knowledgebase Question

Mountain View, Mi
Avatar for Lexie823
Question by Lexie823
May 24, 2010
I have 2 rose beds one near my driveway with full sun, one by house with partial to full sun, both have rock instead of mulch. I am having problems with black spots, losing leaves, ect. Tried various products with no luck. Any suggestions? Would replanting to another area away from rock help?

Answer from NGA
May 24, 2010
A fungus causes black spot on roses. Some cultural practices may be helpful in controlling it. These include planting varieties resistant to the disease, ensuring your plants are in a location with good air circulation, and avoiding wetting the leaves when watering. Clean up and destroy any infected leaves, especially in the fall to minimize reinfection from year to year. A clean layer of organic mulch (such as shredded bark or chopped leaves) applied before the plants leaf out again in spring should also help prevent reinfection. The mulch helps keep fungal spores from splashing up onto the plant and the new foliage. Neem oil may also be helpful. Neem controls aphids and mites on your roses, and also will control powdery mildew and black spot. Be sure to read and follow the label instructions. Rose Defense is one neem oil based products but there are other commercial fungicides available. Some choices include Funginex, Daconil, Captan, Bravo. These may need to be applied every 2 weeks throughout the season so be sure to apply according to label directions. Hope this information is helpful. Best wishes with your roses.

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