Volume 50 Number 2 Article 16
Year 1996 Month 4
Title: Performance of Three Apple Cultivars with 18 Vigorous Rootstocks During Nine Seasons in Washington
Authors: B.H. Barritt, B.S. Konishi, and M.A. Dilley
Abstract:
The performance of 18 apple rootstocks was
evaluated with scion cultivars 'Golden Delicious,'
'Granny Smith' and 'Delicious' during nine seasons.
Rootstocks in the trial, listed in order of
increasing tree vigor, measured as trunk cross-sectional
area (TCA), were M.7A, M.7 EMLA,
MM.lll EMLA, P.13, A.306, MM.106 EMLA,
MM.106, M.2 EMLA, B.490, MAC.16, MM.104
EMLA, M.4, MAC.l, B.118, P.18, MAC.4, A.313
and MAC.24. There was little change in the
ranking of rootstocks for TCA after year 5, and
the influence of rootstocks on TCA was generally similar with each cultivar.
The occurrence
of root suckers with each cultivar was low with
most rootstocks, moderate with M.7 EMLA,
M.4, A.313 and M.7A, and extremely high with
MAC.24. Trees showing the greatest trunk leaning and, therefore, poorest anchorage were
P.13, M.7 EMLA, M.4, B.118, M.7A and M.2
EMLA. The most precocious rootstocks were
B.118, MM.106 EMLA and MM.106, and the
least precocious were B.490, A.306, MAC.16,
MAC.l, A.313 and MAC.24. Cumulative yield
efficiency (kg/cm2) at the end of year 9 was
greatest for M.7A, MM.106, E13, MM.106 EMLA
and M.7 EMLA, and lowest for MAC.16,
MAC.24, MAC.l, B.490, A.313 and A.306. The
influence of rootstocks on cumulative yield
efficiency at year 9 was generally similar with
each cultivar.
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