leaves on rose bushes have black spots - Knowledgebase Question

New Castle, De
Question by Buckalew1
March 26, 2010
have had this problem for 5 years. have tried every thing anyone suggested.


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Answer from NGA
March 26, 2010

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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. There are also other commercial fungicides available. Some choices include Funginex, Daconil, Captan, Bravo. Some roses are just more susceptible to black spot than others. If you still cannot control the disease after trying the above suggestions, it may be time to replace your roses with varieties that have more resistance to diseases. Best wishes with your roses.

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