white and black leaves - Knowledgebase Question

phoenix, Ar
Question by asnyder9
May 2, 2010
Why is my rose bushes leaves getting a white and black color to them. My rose bush is not doing well at all

Answer from NGA
May 2, 2010


The white is probably sunscald and the black is probably a fungal disease called black spot. Especially if you see the same coloration along the stems of the rose bush. 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. Best wishes with your roses.

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