Volume 45 Number 4 Article 7
Year 1991 Month 10
Title: Low Temperature Tolerance of 'Starkspur Supreme Delicious' on Nine Rootstocks in the Iowa 1980-1981 NC-140 Cooperative Planting
Author: P.A. Domoto
Abstract:
'Starkspur Supreme Delicious' apple trees in
the Iowa planting of the 1980-1981 NC-140
cooperative rootstock trial experienced three
late-fall/early-winter freezes, and two freezes
associated with fluctuating temperatures during
four winters of the ten year study.
AH the trees
on MAC.24 were killed following two consecu
tive winters during which freezes occurred in
late-fall or early-winter.
Trees on MAC.9 ex
hibited a high incidence of spar injury, and
reduced vigor that may have been confounded
by prior injury and poor growth of the cultivar
on this rootstock.
Shoot injury evaluations fol
lowing two freezes suggested that trees on
MAC.9 acclimate early but do not attain a high
tolerance to low temperature stress in mid- or
late-winter.
Trees on OAR 1 exhibited a similar
pattern of hardiness reported for M.7, but were
more susceptible to late-fall/early-winter freezes
than M.7 EMLA. Trees on O.3 appeared to be
similar in hardiness to trees on M.26 EMLA.
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