Volume 45 Number 4 Article 2
Year 1991 Month 10
Title: Performance of 'Starkspur Supreme Delicious' Apple on 9 Rootstocks Over 10 Years in the NC-140 Cooperative Planting
Author: NC-140
Abstract:
In 1980-81, trees of 'Starkspur Supreme Deli
cious' on 9 rootstocks were planted at 27 sites in
the United States and Canada according to
guidelines established for cooperative testing
by NC-140. The greatest tree losses occurred
with the rootstocks O.3 (38.9$) followed M.27
EMLA (27.7$), MAC.24 (26.1$), M.9 EMLA
(24.4$) and M.9 (20.0$), with M.7 EMLA (3.3$)
and OAR.l (6.1$) having minimal losses.
MAC.24
produced the largest trees, followed by OAR.l
and.M.7 EMLA, with M.27 EMLA producing
the smallest trees.
Trees on M.9 EMLA, M.9 and
MAC.9 did not differ in tree size.
Trees on
MAC.24 produced excessive suckers and those
on MAC.9 produced an adventitious swelling at
and below the soil line.
Trees on MAC.24,
OAR.l and M.7 EMLA produced much less
fruit/unit trunk cross-sectional area than the
smaller trees.
Calculating production potential
per hectare using actual 10-year-old size, trees
on MAC.9 had the greatest potential, followed
by M.26 EMLA, O.3, M.7 EMLA, and M.9
EMLA, while trees on OAR.l had the lowest
potential.
Comparison over 5 years showed a
tendency for fruit on trees of M.27 EMLA and
OAR.l to have smaller average fruit size.
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