Roses - Knowledgebase Question

Kearny, Ne
Question by Victoria01
June 30, 2010
I get a beautiful 1st bloom from most of my rose bushes and then dribs and draps. One of the bushes has yellow leaves with black spots.
Another bush never blooms yet grows like a weed. This has been happening for the past few years and happens every year. Any suggestions?


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Answer from NGA
June 30, 2010

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What you describe sounds like a fungal disease called black spot. 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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