Early Performance of `McIntosh' Apple Trees on Several Semidwarf Rootstocks in the 1999 NC-140 Rootstock Trial

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  • 1 Univ. of Massachusetts, Plant & Soil Sciences, Amherst, MA 01003-9294
  • | 2 Univ. of Guelph, Plant Agriculture, Simcoe, ON N3Y 4N5, Canada
  • | 3 Pennsylvania State Univ., Horticulture, Univ. Park, PA 16802
  • | 4 Agriculture & Agri-Food Canada, Atlantic Food and Horticulture Research Centre, Kentville, NS B4N 1J5, Canada
  • | 5 Univ. of Vermont, Plant and Soil Science, Burlington, VT 05405
  • | 6 Univ. of Minnesota, Horticultural Science, St. Paul, MN 55108
  • | 7 Univ. of Wisconsin, Horticulture, Madison, WI 53706
  • | 8 Michigan State Univ., Horticulture, East Lansing, MI 48824
  • | 9 Cornell Univ., Horticultural Science, Geneva, NY 14456

`McIntosh' apple trees [Malus ×sylvestris (L.) Mill. Var domestica (Borkh.)] on five semidwarfing rootstocks (CG.4814, CG.7707, G.30N, M.7 EMLA, and Supporter 4) were planted at 10 locations (MA, MI MN NS 2 in NY ON PA VT and WI) under the direction of the NC-140 Multistate Research Project. After four growing seasons (through 2002), trees on CG.7707, G.30N, Supporter 4, and M.7 EMLA were significantly larger than those on CG.4814. Cumulative root suckering was most from trees on M.7 EMLA, and least from trees on CG.7707, G.30N, and Supporter 4. Yield per tree in 2002 and cumulatively was greatest from trees on G.30N and least from trees on CG.7707 and M.7 EMLA. In 2002 and cumulatively, CG.4814 resulted in the greatest yield efficiency, and M.7 EMLA resulted in the lowest. In 2002, fruit from trees on M.7 EMLA were largest, and those from trees on CG.4814 were smallest. On average, M.7 EMLA resulted in the largest fruit, and G.30N resulted in the smallest. Limited data will be presented on CG.6210, CG.8, G.30T, and M.26 EMLA, which are planted only at some locations. Data for the fifth season (2003) will be presented.

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