Friday, June 11, 2021
CapitalPress.com 5
OSU researchers find Southern Oregon
winegrape growers can reduce water usage
By SIERRA DAWN McCLAIN
Capital Press
Willamette Valley Vineyards
David Markel, research and development manager at Willamette Valley Vineyards,
prepares to operate Thorvald at the winery south of Salem.
LEGAL
PURSUANT TO ORS
CHAPTER 87
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following vehicle will be sold,
for cash to the highest bidder, on
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COPART OF WASHINGTON INC
2885 NATIONAL WAY WOODBURN, OR
2017 VW PASSAT 4DR
VIN = 1VWDT7A33HC035990
Amount due on lien $1,455.00
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ALLEN CLAYTON & TRACY HOODENPYL
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COPART OF WASHINGTON INC
2885 NATIONAL WAY WOODBURN, OR
2015 CHEV SILVERADO PU
VIN = 1GC4K1E80FF548022
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MILTON
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2885 NATIONAL WAY WOODBURN, OR
2017 KIA OPTI 4DR
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OREGON STATE C.U
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following vehicle will be sold,
for cash to the highest bidder, on
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at 10:00am by
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2885 NATIONAL WAY WOODBURN, OR
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RU YI CHEN
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irrigators may be irrigating too much.
A “deficit irrigator” watering 25% less
than AgriMet’s suggested 20.2 inches, for
example, is still applying 15.5 inches per
year, above OSU’s suggested 11.4 inches.
Levin arrived at his 11.4-inch “ideal”
by conducting research at vineyards
in Jackson County starting in 2017.
He used solar panels to estimate vines’
evapotranspiration and to find the “crop
coefficient,” which can be plugged into
a mathematical equation for irrigation
adjustments.
AgriMet staff have not yet confirmed,
either to Levin or the Capital Press,
whether they plan to use Levin’s findings
at the weather station. In the meantime,
Levin encourages growers to email him
at alexander.levin@oregonstate.edu for the
new crop coefficient.
Michael Moore, general manager at
Quail Run Vineyards and one of the grow-
ers who participated in Levin’s trials, said
he thinks Levin’s numbers are accurate.
Moore irrigates his winegrapes about 12
inches annually, which he said “feels really
appropriate for our area.”
Although Levin’s study will likely
prove useful in the future, it may have little
impact this year, because growers would be
lucky to have 11.4 inches of water. Some
water districts are telling growers just to
fight for vine survival.
“The scope of the drought going on
right now is monumental,” said Moore.
We have a new crop of
materials for the Worker
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Protect your workers from pesticide exposure
with the WPS. We have a bushelful of materials:
brochures, posters and more.
To learn everything that applies, go to
EPA.gov/pesticide-worker-safety
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LEGAL
PURSUANT TO ORS CHAPTER
87
Notice is hereby given that the
following vehicle will be sold,
for cash to the highest bidder, on
06/21/2021. The sale will be held
at 10:00am by
COPART OF WASHINGTON INC
2885 NATIONAL WAY WOODBURN, OR
2015 NISSAN 370Z 2DR
VIN = JN1AZ4EH2FM444355
Amount due on lien $1515.00
Reputed owner(s)
KIRK & JEANNE SEVERSON
Willamette Valley Vineyards
Willamette Valley Vine-
yards in Turner, Ore.,
is the first commercial
operation to adopt the
Thorvald, an autono-
mous, self-driving robot
equipped with a special
band of UV lights to sup-
press powdery mildew.
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TURNER, Ore. — The
robot shines an eerie green in
the dark of night as it maneu-
vers over rows of grape-
vines at Willamette Valley
Vineyards.
Developed by Norwe-
gian-based Saga Robotics,
Thorvald — as the system
is named — is an autono-
mous, self-driving vehicle
that looks a bit like a small
shed on wheels. Inside, it is
equipped with a special band
of ultraviolet lights designed
to suppress powdery mildew
and other plant diseases.
As research continues to
demonstrate the efficacy
of UV light as a manage-
ment tool for farmers, Wil-
lamette Valley Vineyards
has become the first com-
mercial operation to adopt
Thorvald in place of tradi-
tional chemical fungicides
to control powdery mil-
dew in winegrapes.
“We see this as a
remarkable
opportunity
for our industry to grow
high quality winegrapes
and do it in a very natu-
ral, sustainable way,” said
Jim Bernau, the winery’s
founder and CEO.
While Bernau and Wil-
lamette Valley Vineyards
began experimenting with
UV light last year, sci-
entists from around the
world have been conduct-
ing field trials on and off
for decades, spanning a
variety of crops includ-
ing strawberries, apples,
cucumbers and hops.
Today, a research team
led by David Gadoury,
plant pathologist at Cor-
nell University, is gath-
ering data and refin-
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By GEORGE PLAVEN
Capital Press
Oregon State University
Alexander Levin, professor and viticul-
turist, studies the irrigation needs of
Southern Oregon winegrapes.
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ing treatments using UV
light, with results showing
promise.
Gadoury was the fea-
tured speaker at a webinar
May 27 hosted by Wash-
ington State University
and the Washington State
Wine Commission, pro-
viding vintners with the
latest information about
UV light and its potential
as an alternative for curb-
ing plant diseases.
Powdery mildew, in
particular, is one of the
most widespread prob-
lems in the wine industry.
If not suppressed, the dis-
ease can reduce crop yield
by as much as 95% and
degrade wine quality.
The first field tri-
als using UV light took
place in 1991, though they
were less than successful,
Gadoury said. Though it
effectively reduced pow-
dery mildew in grapes, it
also defoliated vines and
caused the fruit to shrivel,
resembling miniature rus-
set potatoes.
Then came a key dis-
covery 10 years ago. A
doctoral student in Nor-
way found that UV light
was much more effective
killing powdery mildew
at night, when the patho-
gens’ natural systems for
repairing their DNA have
shut down to conserve
energy.
Not only are the patho-
gens more susceptible at
night, but Gadoury said
they were able to use 10%
less UV-C to achieve the
same levels of disease
reduction, at levels that
won’t cause damage to the
plants or fruit.
“Pathogens such as
powdery mildew, and
many other organisms,
just really don’t like UV
light at night,” Gadoury
said. “That means we can
kill them with a fraction
of the dose that’s required
during daylight.”
New
trials
started
in 2017 at a commer-
cial strawberry farm in
Florida. This time, they
proved a rousing success,
performing significantly
better than applications of
chemical fungicides.
Additional trials are
now underway in places
like California and Nova
Scotia, Canada, as well as
overseas in Europe.
“I think we’re beyond
the point where we have
to worry about whether
or not this technology
is going to provide sus-
tainable control of straw-
berry
powdery
mil-
dew,”
Gadoury
said.
“It actually works quite
well.”
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Northwest wine industry eyes UV
light to treat powdery mildew
ROGUE VALLEY, Ore. — Winegrape
growers in Southern Oregon may be able
to slash water usage nearly in half while
still producing high-quality, high-yield
fruit, according to an Oregon State Univer-
sity study.
Many Southern Oregon growers consult
water management data OSU researchers
believe is either inaccurate or designed for
a different region, leading some growers to
irrigate too much.
“Watering twice as long as you need
to is a big deal,” said Alexander Levin,
the study’s leader and assistant professor
and viticulturist at the Southern Oregon
Research and Extension Center.
Overwatering, Levin said, costs more,
hurts the environment, can leach nutri-
ents from soil and wash fertilizer beyond
roots. It can also create leafy canopies that
attract pests and create dark, humid habitat
for fungi. And in a drought, every drop of
water is precious.
In Oregon, many growers use AgriMet,
a free weather station sponsored by the
U.S. Bureau of Reclamation, to deter-
mine how much water they need for spe-
cific crops.
The problem is AgriMet appears to
overestimate how much to irrigate wine-
grapes by 44%.
AgriMet estimates winegrapes in the
region need 20.2 inches of water per year.
Levin’s study found winegrapes need only
11.4 inches annually to thrive.
That number — 11.4 inches — rep-
resents the ideal amount of water vines
need to produce good-quality fruit and
good yields. Winegrapes could survive
with less water, such as 6 to 8 inches, but
will perform better with around 11 inches.
Along with using AgriMet, some grow-
ers also use crop coefficients — proper-
ties of plants used to predict evapotrans-
piration for irrigation scheduling — that
were developed in California, where crop
growth, water requirements, latitude and
weather patterns differ.
By using OSU’s numbers, Levin esti-
mates Southern Oregon growers can con-
serve 11% of their water compared to
using California numbers.
Levin said his findings may even
impact growers who already practice
“deficit irrigating” — applying less
water than is required for a crop. That’s
because, Levin said, even some deficit
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