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effect was a reduction in fungi known
to be nematode pathogens, and the
second effect was an increase in bacteria
known to be able to decay complex
carbohydrates, including carbohydrates
of nematode corpses.
In terms of nematodes in this
experiment, we found that 1,3-D killed
98 percent of the nematodes present in
pre-treatment measurements across all
nematode species assessed, primarily
root lesion and stubby root nematodes.
Although we did not observe statistically
significant differences in potato yield in
2017, we did observe an average 3.4 ton-
per-acre (14.5 percent) increase in yield
in treatments fumigated with 1,3-D over
the non-fumigated control. There also
appeared to be a rate response, with 11,
13, 15 and 20 gallons per acre yielding
11, 15, 15 and 18 percent more than the
non-fumigated control, respectively.
Investigating soil microbial
community structure in response to
different crop management strategies,
including pesticide application, may
eventually help growers manage their soil
microbial communities in ways that will
enhance crop health and productivity.
In potato cropping systems in the short-
term, there may be a greater impact
on the soil microbial community from
agricultural practices such as tillage, use
of cover crops and irrigation than from
fumigant application.
Ken Frost is a plant pathologist at
Oregon State University's Hermiston
Agricultural Research and Extension
Center. He can be contacted at
kenneth.frost@oregonstate.edu.
Yuan Zeng is a post-doctoral researcher
in Colorado State University's Department
of Bioagricultural Sciences and Pest
Management.
Jane Stewart is a professor of plant
pathology at Colorado State University,
and can be reached at
jane.stewart@colostate.edu.
Zaid Abdo is a computational biologist
specializing in metagenomics and
microbiome research at Colorado State
University. He can be contacted at
zaid.abdo@colostate.edu .
Amy Charkowski is a plant pathologist
and head of Colorado State University's
Department of Bioagricultural Sciences &
Pest Management. She can be reached at
amy.charkowski@colostate.edu.
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