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 2003 at 15 sites in the United States (AR, CA, IA, GA, KY, ME, MI, NY, OH, PA, UT, VA, WI), Canada (BC), and Mexico. The Iowa planting, located at the ISU Horticulture Station, includes 23 rootstocks (CG.3041, CG5935, CG.6210, JTE-G, J-TE-H, JM.1, JM.2, JM.7, JM.8, PiAu 51-11, PiAu 51-4, PiAu 56-83, Bud.62-396, B.9, M.9 Pajam 2, M.26 EMLA, M.9 T337, G.16, JM.4, JM.5, JM.10, PiAu 36-2, CG.5179) that are being evaluated with Gibson Golden Delicious serving as the test cultivar.