Agriculture Reference
In-Depth Information
propagated by stooling: it is less productive in the nursery than many other
'Malling' rootstocks. Trees on 'M.
' are poorly anchored and, because of this
and the heavy early crops, need support by individual stakes or wire trellises.
'M.
' is resistant to collar rot but susceptible to fire blight, woolly apple aphid,
crown gall and mildew. It does not tolerate high soil temperature. The main
clones (sub-clones) are all virus-free selections, as follows:
'M.
EMLA' was produced by East Malling and Long Ashton Research
Stations. Trees grafted or budded on it were much more vigorous than
those on the virus-tested (latent virus-infected) 'M.
a' clone which preceded
it and the 'old' 'M.
' infected with latent viruses (Campbell,
). They
gave
years of age than those on the virus-infected
stocks as a consequence of their larger size.
'M.
%morecropupto
') is a Dutch selection which gives trees of similar or
rather smaller size than 'M.
T
' ('NAKB
EMLA' (Webster,
) and of similar cropping
efficiency.
'M.
Fleuren
' is a Dutch selection giving trees about
-
% smaller
than those on 'M.
). It induces a higher yield per
unit of tree volume and, possibly as a result, reduces fruit size slightly.
'M.
T
' (Wertheim,
Pajam
' ('Lancep') is a French clone which has been about
%
more dwarfing than 'M.
EMLA' in some trials but less dwarfing in others
(Callesen,
).
'M.
Pajam
' ('Cepiland') is similar to, or slightly more invigorating than,
'M.
EMLA' or 'M.
T
'.
'M.
RN
' is a Belgian clone, similar in its effects on vigour and cropping
to 'M.
T
'.
'Malling
'
(
'M.
'
) originated at East Malling from a cross made in
between 'M.
' and 'M.
'. It was selected in
(as 'Malling
') and
patented as 'M.
. It is much more dwarfing than either of its parents,
scion cultivars grafted on it giving trees only about half of the size of those on
'M.
'in
'. It is suitable only for orchards of very closely spaced trees or with very
vigorous scion cultivars. It induces precocious cropping but trees on it tend to
have small fruits.
'Malling
'
(
'M.
'
) originated at East Malling from a cross between 'M.
'
and 'M.
' but is less dwarfing and is unsuited
for intensive planting systems, excepting possibly with spur-type scions. It in-
duces precocious cropping and large fruit size but has a less positive effect on
cropping efficiency than 'M.
'. It is better anchored than 'M.
'. It is the most tolerant of low winter temper-
atures of all the 'Malling' rootstocks in commercial use, but is susceptible to
fire blight and to woolly apple aphid and moderately susceptible to crown rot,
although resistant to collar rot.
