Clonal tests of new cottonwood selections from the southeastThis article is part of a larger document. View the larger document here.
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.