Agriculture Reference
In-Depth Information
Table
.
Effect of height of budding of 'Cox' and 'Golden Delicious' on
'M.
', 'M.
' and 'MM.
' on total extension growth (m/tree) over
years
Height of
'Cox' extension
'Golden Delicious'
budding
growth
extension growth
Rootstock
(mm)
(m/tree)
(m/tree)
'M.'
'M. '
'MM.'
rootstocks
.
.
budding height
.
.
From Parry (
). Reproduced with permission.
Effects of interstocks on root and shoot
growth and cropping
It has been known for centuries that a small stem-piece or interstock of a
dwarfing clone inserted between the scion and the rootstock of an apple tree
can dwarf it. In general interstocks of stem material from the 'Malling' se-
ries dwarf 'Cox' and 'Worcester Pearmain' apple trees in rough proportion
to their dwarfing effects as rootstocks (Parry and Rogers,
). 'M.
' was
as dwarfing when used as an interstock on 'MM.
' as when used as a
rootstock (Parry and Rogers,
), whereas other 'Malling'
clones were less dwarfing as interstocks than as rootstocks. Moreover, in
studies with 'M.
; Preston,
' as an interstock above rootstocks other than 'MM.
',
it had a less dwarfing effect than when used as rootstock (Vyvyan,
;
Tukey and Brase,
; Czynczyk,
), and Czynczyk (
) also showed
'B.
' to be more dwarfing as a rootstock than as an interstock. In general,
therefore, the effect of a dwarfing interstock on vigour is less than that of
the same cultivar as rootstock. An interstock of 'M.
' inserted between a
'Crab' rootstock and a 'Bramley's Seedling' scion had a greater effect on
root than on shoot growth, reducing it to half, whereas interstocks of 'M.
'
or 'M.
' had no effect on either root or shoot growth (Swarbrick
et al.
,
).
