GREEN PATCH

By Barbara Pleasant
Published on August 1, 2006
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Topical Gardening Tips

Question:
Late in the summer, I began noticing white, dusty blotches on the
leaves of several herbs, which I fear is powdery mildew. It starts
on the bee balm and then spreads to the rosemary. I eat these
herbs, so I don’t want to use chemicals to control the problem. Is

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