Volume 49 Number 3 Article 31
Year 1995 Month 7
Title: Performance of Three Apple Cultivars with 22 Dwarfing Rootstocks During 8 Seasons in Ohio
Authors: D.C. Ferree, P.M. Hirst, J.C. Shcmid and P.E. Dotson
Abstract:
Rootstocks in this trial produced a continuum
in tree size that could logically be grouped with
the Malling standards as follows: M.27 size
group = B.146, P.16, P.22, Mark and MAC.9; M.9
size group = B.9, V.1, V.3, P.2, M.9EMLA, CG.10,
MAC.39 and C6; M.26 size group = V.2; M.7 size
group P.1, V.4, V.7, OAR1. The virus-free selections M.9EMLA and Mark did not differ significantly in size or cropping from the original
selection of M.9 and MAC.9, respectively.
In
general, as tree size increased, trunk crosssectional
area (TCA) growth increment was
greater as the trees aged.
The following rootstocks had relatively high biennality indexes on
both 'Macspur Mclntosh' and 'Redchief Delicious' the most biennial cultivars in this trial:
CG.10, M.9, MAC.39, V.2, V.4, V.7, M.7EMLA.
'Macspur Mclntosh' on OAR1 was characterized
by having long shoots and large numbers of
non-flowering spurs, while 'Macspur Mclntosh'
on Mark, M.27EMLA and MAC.9 tended to
have short shoots and the fewest non-flowering
spurs and vegetative shoots.
The following rootstocks
tended to increase the density of flowering spurs on 'Macspur Mclntosh': M.9, M.26-
EMLA, V.4, M.7EMLA and V.I. 'Lawspur Rome
Beauty' was the most productive ana efficient
with tne lowest bienniality index and was intermediate in tree size and TCA change compared
to 'Macspur Mclntosh' and 'Redchief Delicious.'
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