Volume 63 Number 3 Article 4
Year 2009 Month 7
Title: Performance of 'Golden Delicious' Apple on 23 Rootstocks at 12 Locations: A Five-Year Summary of the 2003 NC-140 Dwarf Rootstock Trial
Authors: R.P. Marini, B. Black, R.M. Crassweller, P.A. Domoto, C. Hampson, S. Johnson, K. Kosola, S. McArtney, J. Masabni, R. Moran, R.P. Quezada, T. Robinson and C.R. Rom
Abstract:
In 2003, an orchard trial of apple [Malus × sylvestris (L.) var. domestica (Borkh.) Mansf.] dwarf rootstocks
was established at 12 locations in Canada, Mexico, and the United States using ‘Golden Delicious’ as the scion
cultivar.
A core group of 11 rootstocks was planted at all locations.
The four rootstocks included as industry
standards were Malling 26 EMLA (M.26 EMLA), Budagovski 9 (B.9), M.9 Pajam2, and M.9 NAKBT337. The
other seven rootstocks included selections from Russia (B), Cornell-Geneva (CG and G), Czech Republic (J-TE),
and Germany (Pi Au); these included B.62396, CG.3041 [Geneva® 41], CG.5935 [Geneva®935], G.16, J-TE-H,
and Pi Au56-83, and Pi Au51-4. Some locations also received two additional CG rootstocks, seven Japanese (JM)
rootstocks, J-TE-G, or two Pi Au rootstocks.
After five years, trees on J-TE-G were similar in size to B.9; trees
on B.62396 and CG.3041 were similar in size to M.9 NAKBT337; trees on CG.5935, G.16, J-TE-H and M.9
Pajam2 were similar in size to M.26; and trees on Pi Au56-83, Pi Au51-4, Pi Au36-2 and JM.2 were larger than
M.26 EMLA. For the first time in an NC-140 rootstock trial, several rootstocks have higher yield efficiency than
M.26 EMLA and M.9 NAKBT337. Promising new rootstocks with very high yield efficiency included CG.5935,
CG.3041, CG.5179 and J-TE-G.
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