Article Photos: Northern vintners work to improve wines' quality 1/3

  In this Feb. 9, 2012, photo Dave Greenlee pours a glass of a 2011 Marquette nearly ready for bottling at Tucker's Walk Vineyard run by he and his wife, Sue, in Garretson, S.D. A $2.5 million U.S. Department of Agriculture grant is helping university researchers from across a dozen northern-tier states help winemakers and grape growers such as the Greenlees share expertise and develop their markets. (AP Photo/Dirk Lammers)