Volume 47 Number 2 Article 6
Year 1993 Month 4
Title: Evaluation of a Spur and a Standard Strain of 'Mclntosh' on Three Rootstocks and One Dwarfing Interstem Over Ten Years
Authors: W.R. Autio and F.W. Southwick
Abstract:
Performance of 'Rogers Red Mclntosh' and
'Macspur' was evaluated on M.7A, M.26, M.9,
and M.9/MM.111 rootstocks.
Trees on M.9 were
either staked or trained to a 2.1-m vertical
trellis.
After 10 years, trees on M.7A were the
largest.
Those on M.26 and M.9/MM.111 were
similar in size, and trees on M.9 were the
smallest. 'Rogers' trees were larger than 'Macspur'
trees.
Trees on M.9 were the most precocious, with the greatest bloom and fruit set in
the third and fourth growing seasons.
Trees on
M.7A yielded the most fruit through the tenth
season, followed by those on M.26. Staked trees
on M.9 yielded the least. 'Rogers' yielded more
than 'Macspur,' but yield efficiency was greater
for 'Macspur' than 'Rogers.' The most yield
efficient trees were trellised and on M.9, significantly more efficient than staked trees on M.9.
Trees on M.26 and M.9/MM.111 were less
efficient than those on M.9, but were significantly more efficient than trees on M.7A. Tree
spread was used to calculate potential tree
density and potential yield per hectare.
The
greatest potential yields per hectare would be
from trellised trees on M.9, the lowest yields
would be from trees on M.9/MM.111. Trees on
M.7A, M.26, and M.9 (staked) would produce
intermediate and similar yields per hectare over
the first 10 growing seasons. 'Macspur' would
outyield 'Rogers.' The most surface red color
was obtained on fruit from trees on M.9/
MM.lll.
Fruit from trees on M.9 and M.26
were similarly colored, and the least red color
occurred on fruit from trees on M.7A. 'Macspur'
fruit were more highly colored than 'Rogers'
fruit.
Fruit weight was greatest for trees on M.9.
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