November/December 2021 - 15

Top right, University of Idaho
professor Alex Karasev examines
leaves of seed potato plants. Middle,
the team from the Montana Seed
Certification Program goes over
notes at the Othello seed trials.
Bottom, Mark Pavek of Washington
State University.
have an extension objective: trying to
educate growers how to better use these
new research tools. "
Nina Zidack, director of the Montana
Seed Potato Certification Program at
Montana State University, said that she
and her staff have definitely seen lower
levels of PVY in Montana.
" I largely attribute that to some really
positive changes in grower practices
that we've had in the state, " Zidack said.
" Our growers are a lot more conscious
of keeping their early generation seed
lots separated from all other potatoes
so we've got some growers that are
actually growing their nuclear and
generation plots 150, 200 miles away
from the Gallatin (County) just to keep
them isolated and it's really paid huge
dividends. The overall virus levels have
gone down a lot. "
Montana growers plant almost 11,000
acres of seed potato annually. Russet
Burbank ranks number one in acreage
followed by Umatilla, Clearwater
Russet, Ranger Russet and Alturas.
Zidack said that Wilga is the
dominant PVY strain in Montana at
about 80%, followed by NTN with
between 12 and 14%.
Recombinant strains of viral diseases
like PVY are to be expected, Zidack said.
" There will be another one coming
down the pike, I'm sure, " she said.
" There could be some circulating
out there that we haven't even really
identified yet in the background. What
those strains are doing, they're adapting
to whatever resistance profiles are out
in the environment now and when
you start exerting pressure on them by
having resistance in cultivars to other
Spudman * November/December 2021
13

November/December 2021

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