Grapes -- Varieties -- United States; Viticulture -- United States
As in the East, it is necessary in California to remove suckers from
the roots and roots from the cions once or twice during the summer.
Suckers should not be allowed to overshade the graft, though it is
best not to remove them until danger of disturbing the graft is past.
The grafts should be staked and the vines looked after as recommended
for eastern conditions.
[Illustration: PLATE III.--Cover-crops. _Top_, cow-horn turnips;
_bottom_, rye.]
_Bench grafting._
The resistant vineyards of France and California are now started
almost entirely with bench-grafted vines. It has been learned in these
regions that a grafted vine, to be a permanent success, must have the
consorting parts perfectly united, and that the sooner the grafting is
done in the life of stock and cion the better the union. Cions of the
variety wanted are, therefore, grafted on resistant roots or resistant
cuttings in the workshop and then planted in the nursery. Bench
grafting has the advantage over field grafting in time gained and in
securing a fuller stand of vines.
Bench grafting really begins with the selection of cuttings, since
success largely depends on good cuttings of both stock and cion.
Cuttings are taken from strong healthy vines and are of medium size,
with short to medium joints. The best size is one-third of an inch in
diameter, that of stock and cion being the same since the two must
match exactly. The cutting-wood may be taken from the mother vines at
any time during the dormant season up to two weeks before buds swell
in the spring, and the cuttings can then be made as convenience
dictates, though meanwhile the wood must be kept cool and moist, which
is best done by covering them with moist but not wet soil or sand in a
cellar or cool shed. In California, the best results are obtained when
the grafting is done in February or March, though it may be begun
earlier and continued a month later.
_Preparation of cuttings._
The stocks are cut into lengths of about ten inches, a gauge being
used to secure uniform length. The cut at the bottom is made through a
bud in such a way as to leave the diaphragm. The top cut is made as
near ten inches from the bottom as possible, leaving about one and
one-half inches above the top bud for convenience in grafting. The
stock is then disbudded, taking both visible and adventitious buds,
the latter indicated by woody enlargements, to keep down the number of
suckers.
[Illustration: FIG. 12. Bench-grafted cuttings of grape, showing both
the cleft-graft and the whip-graft.]
The cion should be made with but one bud, thereby gaining the
advantage of having every cion the same length so that all unions are
at the same distance below the surface of the ground in the nursery.
The cion is made with about two and one-half inches of internode below
the bud and one-half inch above, a sharp knife being the best tool for
making the cuts.
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