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    Author(s): Jonathan Paul Jeffreys; Samuel B. Land; Emily B. Schultz; Andrew J. Londo
    Date: 2006
    Source: Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 229-233
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (372 KB)

    Description

    One hundred “new” clones and 20 “check” clones were established with unrooted cuttings during March-April 2003 in a second-stage clonal trial in Missouri and Georgia. The new clones had been selected for 2-year superiority in Melampsora leaf rust resistance, height growth, and diameter growth during first-stage rooted cutting trials. All 120 clones were vegetatively multiplied in a cutting production nursery at Stoneville, MS, and cuttings from this nursery were used for the two second-stage trials. Results from second-year measurements of Melampsora leaf rust infection, height, and d.b.h. indicate that geographic patterns of genetic variation were apparent at both sites. Location effects were present for all traits except d.b.h. for the 120 clones tested, and additional gains from selection among clones within origins can be attained for these traits.

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    Citation

    Jeffreys, Jonathan Paul; Land, Samuel B., Jr.; Schultz, Emily B.; Londo, Andrew J. 2006. Clonal tests of new cottonwood selections from the southeast. Gen. Tech. Rep. SRS-92. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. pp. 229-233

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