November/December 2021 - 17

Attendees of the Washington State University seed lot trials in Othello compare notes.
strains, new strains will develop at some
point to overcome that resistance. "
Foliar transmission by aphids is the
primary source of PVY infection in
potatoes.
Zidack said that Montana growers
have found great success reducing PVY
transmission with weekly applications
of mineral oils combined with
traditional insecticides.
" Probably the most important tool is
mineral oil treatments, " she said, " and
those basically they have to be applied
at least weekly because they need to
protect all newly emerging foliage and
we're recommending that those mineral
oil treatments continue through
vine-kill. "
Zidack said that when she first arrived
in Montana 13 years ago there were only
one or two growers using mineral oil
treatments, but she estimates 70-80%
are now using the treatments.
Mark Pavek, Washington State
University
Professor
of
Potato
Extension and Research, oversees the
seed lot trial in Othello. He agreed with
both Karasev's and Zidack's assessments
of the 2021 seed lot trial, saying that " In
2021 we saw a lot less PVY in the seed lot
samples compared to previous years but
if you look across the record of the seed
lot trial the pvy levels fluctuate but this
year seemed to be interestingly low. "
Pavek wasn't sure why PVY levels
were lower this year, but he was not
ready to assign the result to new
varieties because during the past three
to five years the number of seed lots
from various varieties has been similar
in numbers.
Pavek said that the change in the level
of PVY infections in 2021 from 2020 was
too quick to only credit new varieties
but that environment also had a role.
" I think that something may have
happened the year where the seed was
grown to give us better results, " he
said. " Maybe they had a colder winter,
fewer insects but something reduced
PVY I think, but I don't think it was
necessarily due to variety. "
However, Pavek said that if lower
levels of PVY repeat at next year's field
trial then " we can look and see if it is
more than just the environment but if
it doesn't repeat then I will think that
it was largely due to environment but
again also due to change in strains from
PVY-O to the different strains that are
out there. "
Speaking of next year's seed lot trial,
Pavek expressed hope " that the 2022
field day is back to normal. "
He also said next year's field day
would have a demonstration plot
featuring
different
varieties
infected
with PVY strains.
" People can come and look at like 20
varieties commonly grown in the area
and see how the different strains look in
those varieties, " Pavek said, " and see if
you can see them in the foliage and that
will be next year at the field day. "
Spudman * November/December 2021
15

November/December 2021

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