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Biweekly cold hardiness and water content were measured on 1-year-old field cuttings of bearing Concord grapevines at the Horticultural Teaching and Research Center at MSU from Sept. 1998 to Apr. 1999. Cold hardiness index LT 50  (temperature at which 50% of the sample was killed) was determined by three viability tests after laboratory controlled sub-freezing treatments. Weather data were obtained from the MSU agricultural weather automatic system. Average maximum and minimum air temperatures of 1, 3, 5, and 7 days prior to each field sampling were regressed against the LT 50  of the tissues. Our results suggested that: 1) T min1  (minimum air temperature of the preceding 1 day of each sampling) had the most significant correlation with LT 50  and cane water content among all air temperatures analyzed. 2) While cane water content was significantly related to its bark water, the water content of periderm and pith did not. 3) When comparing the effects of T min1  and bark water content on cane LT 50  together, bark water had significant higher coefficient of determination ( R  2 ). This research provided additional information about the mechanisms of plant dormancy and cold hardiness.

194 The Relationships among Preceding Air Temperatures, Cold Hardiness, and Water Content of Concord Grape Canes from Fall to Early Spring