Volume 54 Number 2 Article 19 Pages: 92-107
Year 2000 Month 4
Title: Performance of ´Gala` Apple on 18 Dwarf Rootstocks: Five-year Summary of the 1994 NC-140 Dwarf Rootstock Trial
Authors: R.P. Marini, J.L. Anderson, W.R. Autio, B.H. Barritt, J.A. Cline, W.P. Cowgill, Jr., R.M. Crassweller, P.A. Domoto, D.C. Ferree, J. Garner, A. Gaus, G.M. Greene, C. Hampson, P. Hirst, M.M. Kushad, E. Mielke, C.A. Mullins, M. Parker, R.L. Perry, J.P. Prive, G.L. Reighard, T. Robinson, C.R. Rom, T. Roper, J.R. Schupp, E. Stover, and R. Unrath
Citation
Abstract:
In 1994, trees of 'Gala' apple (Malus × domestica Borkh.) on 18 dwarf rootstocks were planted at 26
sites in North America according to the guidelines established for cooperative testing by the North Central Regional Cooperative Project (NC-140). Rootstocks for this trial included six selections of M.9, two
from the Budagovski (B) series, three stocks from the Polish (P) series and two from the Vineland (V)
series.
M.27 EMLA, B.491, P.16 and P.22 produced the smallest trees, whereas V.I, M.26 EMLA, M.9
RN29 and M.9 Pajam2 produced the largest trees.
M.9 EMLA, M.9 Pajam1, B.9, 0.3, P.2, Mark, B.469,
V.3, M.9 Fleuren56, and M.9 NAKBT337 produced intermediate-size trees.
Among the most dwarfing
rootstocks, cumulative yields were greatest for P.16 and P.22, whereas M.27 EMLA had the lowest
yields.
All rootstocks in the intermediate size class produced similar yields.
Among the most vigorous
rootstocks, Pajam2 had the lowest yields and V.I had the highest yields.
Yield efficiency (YE) was low
at CO, IN, NB, NC NJ, OH, SC, and ME and high at AR, OR, WA, and WI. Rootstocks significantly influenced YE at 19 of the 26 locations.
Among the most dwarfing rootstocks, P.16 had the highest YE.
Among the rootstocks in the intermediate size class, 0.3, Mark, and M.9 NAKBT337 had the highest
YE M.26 EMLA had the lowest YE for the most vigorous stocks.
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