Answer: To store potatoes properly: 1) brush off all soil 2) store spring or summer potatoes for 5-10 days in a dark, cool (60-70 degrees), and moist (humidity of 90%) location. Store fall potatoes at 50-60 degrees for 10-14 days, 3) transfer them to adark, cold (35-40 degrees) location. The curing followed by the cold storage should do the trick. Commercial produce managers do use a special treatment for holding potatoes longer but I don't think the product is available to home gardeners.
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