The Raisin Industry: A practical treatise on the raisin grapes, their history, culture and curingEisen, Gustavus A.
History
The Raisin Industry: A practical treatise on the raisin grapes, their history, culture and curing
Eisen, Gustavus A.
Raisins; Viticulture -- California
even root, the callus and roots may be cut away without great injury to
the cuttings. If the cuttings are dry, they should be soaked for a few
hours in tepid water, and afterwards buried in moist sand. This
treatment is often useful for imported cuttings which have been injured
in transit. They often recover vigor wonderfully fast, and should never
be given up for lost as long as there is any green-colored cambium left,
in which the sap may again be brought into circulation.
_Various Methods of Grafting._--The general way to graft is to graft on
old stocks. Vines of one variety are thus changed into the variety we
wish to grow, and from which the scions are taken. The first step is to
dig away the soil from the vines down to the first roots, which should
be done by a separate gang of men. Next the stocks are sawed off
horizontally at the first roots, or say from four to six inches below
the surface of the soil. This should also be done by separate hands so
as to insure rapidity and skill in the work. Some grafters saw off the
stocks somewhat slanting, so as to cause them to shed the sap which
always exudes from the stump. Next in order comes the splitting of the
wood of the stock and the insertion of the grafts. This requires care
and skill, and should not be done by careless hands.
The splitting of the stock is done in several different ways, and to
accomplish it we can either use a knife and a wooden mallet or a
hand-saw. If the former is used, the knife must be sharp and thick, so
as to stand the blows of the mallet. Some growers even use a sharp
chisel. If a saw is the tool used,--and I prefer it every time,--the
edges of the old wood should afterwards be pared off smoothly with a
sharp knife, so as to leave no rough marks of the teeth of the saw. The
stock is split straight across, as in the cleft graft, and one scion is
then inserted at each end of the cleft on opposite sides of the stock;
or the stock is split on one side only, care being taken that the cleft
does not extend across the stump, and in this cleft a scion is carefully
fitted as before; or a wedge-shaped piece may be sawed out or cut out of
the stock, and of the size that can be fitted by a scion. It makes but
little difference what method is used, as with ordinary care and skill
the scions will take quite readily. Even if they should entirely fail,
the same stocks may be grafted over next fall or next year, as they keep
their vitality almost unimpaired for years after they are cut. It is
only necessary to saw them off until fresh wood is reached.
[Illustration: Simple Lateral Cleft Graft, 1_a._ Splitting the Trunk,
1_b._ The Scion, 1_c._ The Beveled End of the Latter, 1_d._ Scion and
Stock Joined.
2. Simple Transversal Cleft Graft with Two Scions. 3. Cleft Grafting
with a Cutting Graft. Champin Graft, or Graft on a Rooted Vine. 4_a._
Graft and Stock Before being Joined. 4_b._ The Same After being Joined.
All after Aimé Champin’s “Vine Grafting.”]
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