About 2/3 of my Swiss chard leaves are plagued with something that makes them yellow and wilt, and eventually turn brownish gray and shriveled up. I pulled all the leaves that were afflicted this morning, but have no idea how to combat this, preferably naturally since I'd like to eat what remains. Any experienced gardeners who can help? If it helps, I'm in San Francisco, Northern California, and I planted the seeds about 6 weeks ago, or early May.
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