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L Grafting bunch grapes
8. L- By J. A. Mortensen, IFAS
Age' cultural research C(rinte, -,Lr/, '
Dec. 9, '198 JUP 24 ;4 5 ,
Of the bunch grape varieties resistant r-. (:ter f's disease,
..... '; V of F!orf-!
the following perform best if grafted on a nematode-rs'i'-t-anti
rootstock: Stover, Conquistador, Black Spanish, and Roucaneuf.
Grafting is best done at the latter end of the dormant season,
usually mid-February to mid-March. The rootstock should be cut off
with a saw or sharp shears at a smooth place between nodes about
2 inches above ground level. The stump, if small, should be split
with a sharp knife; larger stumps may be split with a grafting tool
or wide chisel. Rootstocks grown in pots can be cut off and split
while still in the pot. Make the split about 1 1/2 inches deep,
and avoid going deeper.
The budwood for scions should be chosen from healthy vines. A
graft scion should be 5 to 8 Inches long with 2 or more buds and
1/4" 3/8" diameter. The portion of the scion to be inserted in the
cleft should be cut carefully to a long, tapering wedge, preferably
slightly thicker on one side. The wedge cut should be started just
below the basal bud on both sides. Usually only one scion is used if
the stump diameter is 1" or less. Two scions may be used on larger
stumps. The scion should be inserted carefully into the ,cleft so
t hat the cambium on Its thicker edge and that of the stock coincide.
The pressure of a large stump may hold a scion securely; small stumps
should be tied firmly with raffia or soft string.
Leesburg ARC Researich Report LBG82-4
Grafts are mounded with soil to prevent drying of the scion. To
protect the soil cover from erosion by wind and rain, a half-gallon
milk carton (cut In half) may be placed over the graft and filled
with clean, moist builders sand up to the top bud of the scion.
During dry periods, water once a week or more often as needed.
The grafted vine should be trained to a single shoot on a stout
permanent stake attached to the trellis wire. With potted root-
stbcks, make sure stake extends deeply enough into the pot that it
won't fall over. The milk cartons should be removed after scion
growth exceeds 15 inches up the stake, and string ties should be
removed to prevent girdling.
SURFACE OF GROUND