April 2019 - 24

Potato Virus Y Update
Studies show how different strains can affect different cultivars
By Zeke Jennings
MANAGING EDITOR
Potato virus Y (PVY) is one of the
most troublesome diseases potato
growers face. The virus can have a
backbreaking effect on a farm's bottom
line, both in terms of yield and in
marketability of those tubers that are
produced. In a recent online survey,
Spudman readers said PVY concerns
them the most of any potato plant
disease (see Page 30).
PVY can cause unsightly potato tuber
necrotic ringspot disease (PTNRD)
and affect the size, gravity and
number of tubers a plant produces. It
can break the skin on tubers, which
becomes an entry point for other
pathogens and pests.
About a half-dozen strains of PVY
currently are present in North America.
They include:
* PVYN
* PVYNE-11
* PVYNTN
* PVYN:O
* PVYN-Wi
(aka N-Wilga)
* PVYO
Researchers from the University
of Idaho have been conducting PVY
experiments
at
commercial
fields
and seed lots in Hermiston, Oregon,
and Othello, Washington, since 2011.
(Postharvest and storage studies also
took place in Kimberly, Idaho.)
The basis of the trials is to see how
different cultivars react to the various
strains of the virus. Two of the leaders
in the research, Nora Olsen and
Alexander V. Karasev, both professors
at the University of Idaho, presented
an update on their findings during the
Idaho Potato Conference and Ag Expo
earlier this year.
Karasev said the Columbia Basin is
ideal for PVY research because growers
24
Spudman.com
Strains of Potato Virus Y in
North America
N-Wi (most common)
NTN (slowly gaining in prevalence)
O (diminishing)
N
NE-11
N:O
PVY Symptoms of Inoculated
Potatoes in Storage
Healthy
Variety
Alturas
None
Burbank None
Ranger
None
Umatilla None
O
70%
14%
100%
69%
NTN
22%
N-Wi
53%
20% None
29%
17%
None
None
(Data based on University of Idaho studies in
Hermiston, Othello and Kimberly.)
import seeds from around North
America.
Studies
included
keeping
tabs on the progress of plants where
the virus was present in the seed and
plants that became infected later. They
monitored plants while growing, as
well as if and when tubers developed
symptoms while in storage.
PVY IS CHANGING
N-Wilga (N-Wi) has become the
most common strain, according to the
research, which showed that Wilga
accounted for approximately 70 percent
of cases.
" PVY is changing, " Karasev said.
" PVYO has been replaced by N-Wi. NTN

http://www.Spudman.com

April 2019

Table of Contents for the Digital Edition of April 2019

April 2019 - 1
April 2019 - 2
April 2019 - 3
April 2019 - 4
April 2019 - 5
April 2019 - 6
April 2019 - 7
April 2019 - 8
April 2019 - 9
April 2019 - 10
April 2019 - 11
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April 2019 - 14
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April 2019 - 44
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