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Around The Vineyard

was the first PM resistant selection to be brought applied cultural treat-
in for evaluation by the California Table Grape ments. Vitis cinerea
Commission, where there were positive comments (Ren2) is the source of
from evaluators regarding the fruit attractiveness this selection’s powdery
and productivity. It was finally removed from vari- mildew resistance. The
ety consideration because of excessive fruit acidity. round attractive fruit
We have continued to use this accession as a quali- ripen in mid-September
ty parent for Ren4 crosses. and produce a 7 gram
berry with 21° Brix.
Y306-196-10 This Consumer evaluations
natural dry-on-vine have been positive, with flesh texture and sweet-
raisin selection has ness being notable positive attributes.
all the makings of a
new raisin cultivar. Y514-109-12 This
The vine is extremely late-season table
productive and berries grape selections
begin drying down owes its resistance
in early August. Dry to V. romanetii, the
product quality is very donor of Ren4. It
high and berries resist powdery mildew infection is currently being
because of the carried Ren4 gene. The selection evaluated for the
is currently under yield evaluation to examine its possibility of release
commercial potential. in collaborative trials
with the California Table Grape Commission. The
Color Population: It white-skinned selection has achieved 1076 boxes
is difficult to identify per acre in these trials, with clusters averaging 1.3
new red-skinned table lb. on spur-pruned vines. Fruit of this selection are
grape selections with particularly clean, due in part to its vigorous canopy
high quality skin color, that protects developing berries from both sunburn
so a 300-vine popula- and ambering. While this selection may or may
tion was created from not ever become a new cultivar, its genetics have
red-skinned parents already been used for several seasons to donate its
that differed greatly unique combination of powdery mildew resistance
in the quality of skin and fruit quality traits to new seedlings.
color. The reason for creating this population is to
identify a DNA marker that is linked to high quality Cornell Grape Breeding
red skin color. All fruiting vines are being pheno- and Genetics Program
typed for skin color quality, and vine DNA profiles Cornell AgriTech, Horticulture Section
will be examined to identify any markers linked to Cornell School of Integrative Plant Science
high quality red skin color. Depicted in the photo Geneva, NY
are fruit clusters from two vines: a high quality red
to the left of the trunk, and low quality red to the Bruce Reisch, Professor
trunk’s right.
NY12.0107.01 This white wine grape selection is
Y511-151-12 This is the first red-skinned selection derived from a complex cross made in 2012, and
with powdery mildew resistance to be evaluated confirmed through VitisGen marker analyses to
for fruit quality in advanced selection trials. Fruitful carry both Run1 (for powdery mildew resistance)
on both spurs and canes, the selection yielded and Rpv1 (for downy mildew resistance). This par-
between 950 to 1400 boxes per acre, depending on ticular vine was planted in 2014 as a single vine

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