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How to Treat Rose Powdery Mildew.
Make sure your roses never go short of water and start spraying as soon as the foliage first appears in the spring.
Use a systemic fungicide recommended for use on roses.
Apply as soon as the leaves have appeared in the spring and again during early May and again during early June.
If the symptoms appear later in the summer, spray fortnightly till symptoms abate.
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