To evaluate the adaptability and performance of new and promising apple rootstocks in the dwarfing size-control category, a NC-140 regional rootstock trial was established in 2010 at 12 sites in the United States (CO, IA, IL, IN, MA, MI, MN, NJ, NY, OH, UT, WI), two sites in Canada (BC, NS), and one site in Mexico (CHIH) with Honeycrisp serving as the test cultivar. The Iowa planting, located at the ISU Horticulture Research Station, includes 31 rootstocks with new selections from theCornell-Geneva breeding program (G., CG.),Russia (B.), and Germany (PiAu , Supp.), with M.26, M.9 Pajam 2 and M.9 T337 serving as industry standards. Tissue cultured propagated (TC) rootstocks of G.41, G.202, and G.935 were included for comparison with normal (N) stool bed propagated rootstocks. This report summarizes the tree-growth characteristics of the Iowa planting during the 2012 growing season.
Iowa State University
Domoto, Paul A. and Schroeder, Lynn R., "Third Year Performance of Honeycrisp on Dwarfing Rootstocks" (2013). Iowa State Research Farm Progress Reports. 1892.