The Bud-Graft Method of Propagating Vinifera Grape Varieties on Rootstocks. Page: 1
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THE BUD-GRAFT METHOD OF PROPAGATING
VINIFERA GRAPE VARIETIES ON ROOTSTOCKS
By ELMER SNYDER, pomologist, and F. N. HARMON, assistant pomologist, Division
of Fruit and Vegetable Crops and Diseases, Bureau of Plant Industry
The growing of Vitis vinifera varieties of grapes on their own roots
in the older grape districts of California is becoming extremely
hazardous because of the possibility of infestation by phylloxera
(Phylloxera vitifoliae Fitch) and the root knot nematode (Heterodera
marioni (Cornu) Goodey). To overcome these pests, the desired
vinifera varieties can be grafted on rootstocks resistant to both
phylloxera and root knot.
The bud-grafting method is one of the more popular means of
establishing vinifera vineyards on grape rootstocks. The bud graft
as applied to grapes differs from the budding of other fruits in that
along with the grape bud a considerable amount of woody tissue is
also included. The method described in this leaflet has been used
satisfactorily in the Federal experiment vineyards in California for
more than 15 years. It can also be adapted to other sections in estal,)lishing
grapes on rootstocks.
Planting the Rootstock
In California the grape rootstocks are usually planted (luring
February and March. Previous to field planting, tle stock rootings
are pruned by cutting off all side rootlets and leaving the basal roots
4 to 6 inches long. All buds are removed from the stmlrp or original
cutting of the rooting to prevent the growth of stock suckers. Tlie
top shoot growth of the rooting is pruned back to one or more spu)lrs
of two buds each. The rootstock should be planted so tllat 2 to 3
inches of the root stump or portion of the original stock cutting is
above the soil level. This portion of the original cutting left above
ground furnishes a suitable place to later insert the vinifera scion bud.
Soil is worked toward the stock vine to keep this portion of the stump
protected from drying during the summer months.
Selection of Scion Buds
The scion buds should be selected from the current season's growing
shoots that show maturity by the brown coloring of both the wood
and buds. Since grape mutations, or offtypes, are known to occur,
the buds should be selected from vines or shoots bearing fruit tliat is
characteristic of the desired vinifera variety. When convenient,
scion bud sticks should be cut fresh several times a day during the
budding operations. If this is not possible and it is necessary to
cut a supply of bud sticks prior to the budding, they shoul( be carefully
protected from drying.
100478 -39 1
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Snyder, Elmer & Harmon, Frank Nelson, 1895-. The Bud-Graft Method of Propagating Vinifera Grape Varieties on Rootstocks., book, 1939; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5984/m1/2/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.