Volume 60 Number 2 Article 9
Year 2006 Month 4
Title: Performance of 'Gala' Apple on Four Semi-Dwarf Rootstocks: A Ten-Year Summary of the 1994 NC-140 Semi-Dwarf Rootstock Trial
Authors: R.P. Marini, B.H. Barritt, G.R. Brown, J. Cline, W.P. Cowgill, Jr., R.M. Crassweller, P.A. Domoto, D.C. Ferree, J. Garner, G.M. Greene, C. Hampson, P. Hirst, M.M. Kushad, J. Masabni, E. Mielke, R. Moran, C.A. Mullins, M. Parker, R.L. Perry, J.P. Privé, G.L. Reighard, T. Robinson, C.R. Rom, T. Roper, J.R. Schupp, E. Stover and C. Unrath
Abstract:
In 1994, trees of ‘Gala’ apple (Malus × domestica Borkh.) on 4 semi-dwarf rootstocks were planted at 20 locations
in North America according to the guidelines established for cooperative testing by the North Central Regional
Cooperative Project (NC-140). The four rootstocks were P.1, V.2, G.30, and M.26 EMLA. Four of the locations
did not receive trees on P.1 rootstock.
Tree losses were greatest for G.30. Trunk cross-sectional area (TCSA) was
generally largest for P.1 and smallest for G.30. TCSA was most variable for M.26; at some sites, trees on G.30 had
larger trunks than trees on M.26. Tree height was usually greatest for P.1 and tree spread was usually smallest for
M.26 EMLA. Although results were not consistent for all sites, yield and yield efficiency tended to be highest for
G.30 and lowest for P.1. Although the effect of rootstock was not consistent, cumulative yield efficiency tended
to be lower for G.30 than for M.26 or V.2. Trees on P.1 and G.30 produced the most root suckers.
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