Answer: Swiss Chard is a sun-loving vegetable that grows best in warm weather. The leaves may be developing powdery mildew because of warm day and cool night temperature. I've had similar problems with chard and either cut away any damaged parts, or wash the mildew off with mild soap and water, then rinse well. Since the leaves are generally cooked before eating, all traces of the mildew will be gone. To avoid problems in the future, try planting your chard earlier in the spring so it will mature during the summer, or plant it now so you can harvest in early spring.
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