Rootstock Chart

Rootstock Protocol 2010 Vitis Parentage Phylloxera
Nematode Resistance Tolerance Influence on Scion Comments
Root Knot Xiphinema Index Drought Wet Soil Salinity Lime Vigor
039-16 2014 k H L H L L L H Poor on coarse, sand soils due to low root knot nematode  tolerance.  Tolerant of fanleaf virus.
101-14 Mgt 2015 e H M-H M L M M L-M L-M Moist, clay soils, tolerates wet soils. Avoid clay soils that crack.
1103P 2014 d H M-H L M-H M-H M M MH Adapted to drought and saline soils
110R 2014 d H L L H L-M M M M-H Hillside, gravelly and acid soils. Develops slowly in wet soils. Slow to establish. Sensitive to Latent Virus.
140Ru 2014 d H L-M L H L H M-H H Adapted to drought and acid soils. Does poorly in non-irrigated, low K soils
161-49 n/a c H L L L L L M H Humid, fertile soils.
1616C 2015 g H H L M M L-M M Best on fertile, med. to fine textured soils; tolerates acid soils. Poor on infertile, sandy soil.
3309C 2014 e H L L L-M M L-M L-M L-M Deep soils. Sensitive to latent viruses; tolerant of cold injury
420A Mgt 2017 c H M L L-M M L M-H L Fine textured, fertile soils. Scions tend to overbear when young. Maintains scion. Growth into late season.
44-53 M 2014 f H L H L-M M-H High Mg soils. Readily Mg deficient in low Mg soils.
5BB 2015 c H M M M L M M-H M Moist, clay soils. Susceptible to phytophthora root rot; adapted to high vigor varieties
Dogridge n/a h M-H H L-M M L-M M-H M VH Very sandy, infertile soils. Promotes excess vigor, poor fruit set.
Fercal n/a j H M M M M-H H H Mg deficient soils.
Freedom 2015 i L-M2*(revised) H M-H M L L-M M H Sands to sandy loams. Sensitive to latent viruses.
Gravesac n/a l H L L M M M H Mg deficient soils.
GRN-1 (8909-05-AW) 2016 n VH VH VH M T L L M-H Also highly resistant to ring, citrus and lesion nematodes.
GRN-2 (9363-16-AW) 2016 o VH VH VH M M M? M L-M Also highly resistant to lesion nematode  and moderately resistant to citrus and ring nematode.
GRN-3 (9365-43-AW) 2016 p H VH VH M-H M M-H? M-H M+ Also resists citrus and lesion nematodes,  but not ring.
GRN-4 (9365-85-AW) 2016 GRN-3 sibling H VH VH H M M-H? M-H M-H Also resists citrus and lesion nematodes,  low to moderate ring resistance.
GRN-5 (9407-14-AW) 2016 q M-H VH VH H L-M M-H? M-H H Also resists citrus and lesion nematodes, moderate ring resistance, moderately difficult to propagate
Harmony 2015 i L-M2 *(revised) M-H M-H M L L-M M M-H Sandy loams and loamy sands.
Riparia Gloire 2015 a H M M L L M L L Deep, well-drained, moist soils, early maturation; scions tend to overbear
RS-3 2016 m H H L-M M M-H Broad nematode  resistance.
RS-9 n/a m H L L-M M L Suitable for close plantings.
Salt Creek (Ramsey) 2015 h H H L-M M-H L-M H M H Sandy, infertile soils.
5C 2014 c H M M L M M M L-M Moist, clay soils, avoid clay soild that crack.
Schwarzmann 2014 e H M H M M M-H M M Moist, deep soils.
SO4 2015 c H M M M M L-M M L-M Moist, clay soils, high K uptake.  Noted as a cool region rootstock.
St. George (Rupestris du lot) 2016 b H L L M-H L-M M-H M M-H Deep & gravelly  soils; K deficiency.  Fruit set problems w/ some scions, latent virus tolerant

Adapted from a chart prepared by UC Davis viticulture specialists, faculty and cooperative extension farm advisors.

Legend for Vitis Parentage:

a - Riparia
b - Rupestris
c - Berlandieri x riparia
d - Berlandieri x rupestris
e - Riparia x rupestris
f - Riparia x (Condifolia x rupestris)
g - Longii x riparia
h - Champinii
i - 1613 (solonis x Othello) x Dogridge
j - Berlandieri x Columbard
k - Vinifera x Rotundifolia
l - 161-49 x 3309
m - Ramsey x Schwarzman
n - Rupestris x Rotundifollia
o - (Rufotomentosa x Dogridge x Riparia Glorie) x Riparia Glorie
p - (Rufotomentosa x (Dogridge x Riparia Glorie) Champinii c9038))
q - (Ramsey x Riparia Glorie) x Champinii c9021


VL - Very Low
L - Low
M - Medium
H -High
VH - Very High
T - Tolerant

The degree of long term phyloxera resistance is questionable due to the unknown Vitis vinifera parentage of these rootstocks.