Over the last 100 years, potato growers have too often seen their income reduced by the common scab disease. In Wisconsin alone, a recent survey identified common scab as the major contributor to cull piles or potato waste. A few years ago, when I got involved in potato breeding and variety development at the University of Wisconsin-Madison, it was obvious that common scab resistance needed to be a main objective of the potato breeding program. What was not obvious at all was how to do it.
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