Vol. 53

Title:
Scion and Rootstock Affect on the Performance of Grafted Black Walnut Cultivars

Authors:
Mark V. Coggeshall, Andrew L. Thomas and J.W. Van Sambeek

pp: 555-556

Abstract:
Eastern black walnut (Juglans nigra L.) is prized for both its timber and edible nuts and has been suggested as a desirable tree species to use in agroforestry-based systems in the Midwestern U.S.A. (Garrett and McGraw, 2000). New plantings of improved cultivars will be required to fully realize the economic gains expected when managing for nut production (Jones, Mueller, and Van Sambeek, 1998). Grafting is currently the most effective method used to vegetatively propagate eastern black walnut (Coggeshall and Beineke, 1997). Yet to be defined, however, are the long-term effects of different rootstock sources on scion survival, growth, and nut productivity for this species. In California, scions of Persian walnut (J. regia) can exhibit increased vigor and pest resistance when grafted on specific rootstocks (McGranahan and Leslie, 1990). Likewise, it is possible that the use of rootstocks grown from seeds of popular black walnut cultivars might also convey some advantages in terms of

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