Volume 46 Number 2 Article 2
Year 1992 Month 4
Title: Early Performance of Four Apple Cultivars on Mark and Other Rootstocks in Maine
Author: J.R. Schupp
Abstract:
In 1985, a study was established to compare
the growth and fruiting of 'Cortland,' 'Empire,'
'Delicious' and 'Mclntosh' apple (Malus domestica
Borkh.) on Mark and MM.lll rootstocks.
'Delicious' and 'Mclntosh' on M7A and M.26
were also included.
Tree survival for the first six
years was 90% or greater for all combinations
except 'EmpireVMM.lll, 30% of which died as
a result of winter injury.
Burrknots occurred on
all cultivar/rootstock combinations, with the
fewest on 'Mclntosh'/MM.lll.
Early flowering
was greatest with 'Empire' and 'Mclntosh' on
Mark.
M.26 also induced early flowering, while
M.7A induced early flowering with 'Delicious'
but not with 'Mclntosh.' Cumulative yield was
highest with 'Mclntosh on Mark and M.26 and
with 'Cortland'/Mark.
The lowest cumulative
yields were recorded for 'Empire'/MM.lll and
for 'Delicious' regardless or rootstock.
Tree
leaning was severe for trees on Mark or M.26,
and growth proliferations at the soil line were
observed on all cultivar Mark combinations.
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