February 2021 - 19

Pest of the Month: Rhizoctonia
As far as pest and pestilence go,
rhizoctonia is one of the few that appears in
every potato growing region on a consistent
basis. Besides the obvious problems with
yield and black scurf
that growers have
when rhizoctonia
is out of control,
the other issue is the lack of diversity in
chemistries used to fight rhizoctonia.
Strobilurins are the most widely used
chemistry, but growers can run into yield
loss as well as resistance management
issues when strobilurins are used alone to
fight rhizoctonia.
Scott Ockey, field development manager
for the Western U.S. at Certis USA LLC,
recommends growers combine the use of
strobilurins and other products with some
other methods of control, such as cultural
practices and a biological to both combat
the fungus and the yield loss.
Ockey recommends these practices in
order to reduce the number or severity of
outbreaks of rhizoctonia:
1. Cultural practices: Increase the speed
to sprouting, such as by using the
deep planting with shallow soil cover
methodology in order to promote a
faster emergence.
2. Crop rotation: Growers need to rotate
potatoes with other crops besides
sugar beets or alfalfa, which are both
susceptible hosts for rhizoctonia in soil.
3. Clean seed: Be certain growers start
with clean seed. University seed
certification programs will provide the
details about the levels of inoculum,
bacteria, fungi and virus in seed lots to
the seed producers, who will provide
that information to growers. Only
work with clean seed to reduce the
chances of major rhizoctonia and other
disease infections.
However, once rhizoctonia has invaded
a field, using the right treatments is key to
controlling it and reducing the negative
effects it can have on a field. Combining
traditional chemistries like strobilurins
with newer technologies such as the
biofungicide Double Nickel®, from Certis,
creates the strongest duo in the battle
against rhizoctonia infections.
By adding Double Nickel, growers can
improve the yield they could otherwise
lose to rhizoctonia or strobilurins.
" Compared to strobilurins, Double Nickel
can average 10-15% increased yield over
potatoes only treated with strobilurins, "
Ockey said. Fields with lower levels of
inoculum may not have results that
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dramatic, but it's a possibility, according to
Ockey. In other words, it negates that yield
reduction often seen with strobilurins.
Plus, Double Nickel isn't just used
for rhizoctonia.
" While it does
control rhizoctonia,
and is reliable in
combination or as an alternative to
strobilurin fungicides, it also has efficacy
on a number of potato diseases, such as
early blight and white mold, " said Jeremy
Adamson, product manager at Certis USA.
For more information about Double
Nickel, visit www.certisusa.com.
Scott Ockey

http://www.certisusa.com

February 2021

Table of Contents for the Digital Edition of February 2021

February 2021 - 1
February 2021 - 2
February 2021 - 3
February 2021 - 4
February 2021 - 5
February 2021 - 6
February 2021 - 7
February 2021 - 8
February 2021 - 9
February 2021 - 10
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