Volume 52 Number 3 Article 32
Year 1998 Month 7
Title: Growth and Productivity of Disease-Resistant Apple Cultivars on M.27 EMLA, M.26 EMLA and Mark Rootstocks
Authors: J.R. Schupp and S.I. Koller
Abstract:
The growth, precocity, yield, and fruit size of 'Liberty,' 'NY 75414-1,' 'NY 74828-12,' and 'NY
65707-19' on M. 27 EMLA, M. 26 EMLA and Mark rootstocks, with 'McShay' on M. 26 EMLA and
Mark, were compared. 'Liberty,' 'McShay,' and 'NY 74828-12' trees were larger than 'NY 75414-1,'
while 'NY 65707-19' trees were the smallest.
Among rootstocks, trees on Mark were larger than trees
on M. 26, while trees on M. 27 were the smallest.
There were no interactions between cultivar and rootstock
on tree growth in this study. 'NY 74828-12' produced the most flower clusters in the third and
fourth years of the study, and 'NY 65707-19' the least.
In 1993, trees on Mark had more flowers than
those on M. 26, while trees on M. 27 had the fewest flower clusters. 'Liberty,' 'NY 75414-1' and 'NY
74828-12' produced higher cumulative yield than 'McShay' and 'NY 65707-19.' Trees on Mark had
higher cumulative yield than M. 26, while trees on M. 27 produced the smallest yields.
Fruit size was
greatest for 'NY 65707-19' and smallest for 'NY 74828-12.' Trees on M. 27 produced smaller sized
fruit than trees on M. 26 or Mark. 'NY 75414-1' had moderate vigor, high precocity, yield, and yield
efficiency, with acceptable fruit size. 'NY 74828-12' also performed very well in this trial, but possesses Vm resistance to apple scab, not Vf, and is unlikely to be named.
Among the disease-resistant
apple cultivars (DRC) in this trial, 'Liberty' and 'NY 75414-1,' based upon precocity, vigor, yield, and
fruit size, have the best potential for commercial production.
Mark rootstock produced the largest trees
with the highest yields, and was superior to M. 26 as a rootstock for the DRCs in this study.
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