Blight tends to blow in from other tomato/potato crops in the area so it's probably more important to protect next year's crops from air/rain-splash than from contaminated soil. Greenhouse crops are usually okay, and if you can rig a bit of clear plastic over outdoor plants to keep the rain off the foliage, they're more likely to stay uninfected.
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Date: 2010-09-21 10:13 am (UTC)