The Q&A Archives: Zinnia Disease: Brown Leaves

Question: Where does the 'brown leaf ' disease come from on Zinnias? Seeds, Planting Soil, Bedding Soil, Air Borne? What is the best way to control this disease (problem)?

Answer: Based on your description I think you are asking about mildew or perhaps one of the other diseases which attack the foliage, especially during muggy humid weather. The best ways to prevent this are to grow the plants in an open position in full sun with plenty of air circulation around them, avoid overhead watering, select resistant varieties, and keep them generally healthy by providing them with good soil and regular watering if needed. Some of the more disease resistant varieties are Profusion Cherry and Profusion Orange, the Oklahoma Series and finally, the Pinwheel Series is particularly resistant to mildew.

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