Agriculture Reference
In-Depth Information
M.26
1-year-old rootstocks
2-year-old rootstocks
100
50
0
−
15
−
10
−
5
KSC.28
M.9
100
100
50
50
0
0
−
15
−
10
−
5
−
15
−
10
−
5
BA
MM.106
100
100
50
50
0
0
−
15
−
10
−
5
−
15
−
10
−
5
Temperature (
°
C)
Figure 2.6
Percentage tree mortality of 1- and 2-year-old apple
rootstocks 'M.9','M.26','MM.106','Beautiful Arcade' ('BA'),and
'Kentville Selected Clone 28' ('KSC.28') of 'Beautiful Arcade' following
low temperature treatments. Reproduced from Priv e and Embree
(1997) with permission.
of trees on 'M.
' and 'B.
' were killed although nearly
% of trees on 'M.
'
died (Czynczyk and Holubowicz,
).
' is regarded as moderately sensitive to winter freezing, it has
been grown in British Columbia, Canada (mainly in the Okanagan Valley) for
Although 'M.
years with few losses from winter injury (Quamme
et al
.,
).
Resistance to soil moisture stress
The most important stress associated with soil moisture is that due to water-
logging and anaerobiosis. This is particularly dangerous if it occurs in the
non-dormant period after the trees leaf out. In general the 'Merton Immune'
and 'MM.' rootstock series, descended from 'Northern Spy' and in many cases
'M.
',whicharesensitive,rangefromsensitivetoverysensitivetowaterlogging
(Cummins and Aldwinkle,
), and 'M.
', 'M.
' and 'M.
' show field
