Soybean cyst nematode is the most damaging soybean pathogen—and it’s rapidly spreading

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Christopher Marett (left) and Gregory Tylka (proper) Credit: Christopher Marett and Gregory Tylka

The soybean cyst nematode (SCN) is the most damaging pathogen of soybeans in the United States and Canada and it is spreading rapidly, in response to info compiled by Gregory Tylka and Christopher Marett, nematologists at Iowa State University. SCN was first present in the United States in 1954 and most current estimates present that SCN leads to $1.5 billion in annual yield losses.

“The continuing spread of SCN is alarming, but not surprising,” stated Tylka. “Anything that moves soil can move the nematode, including wind, water, and farm machinery.” In an article revealed in Plant Health Progress, Tylka and Marett report that SCN was present in 55 new counties in the United States and 24 new counties and rural municipalities in Canada between 2017 and 2020. Most dramatically, New York State, which noticed SCN in just one county pre-2017, reported SCN in 29 new counties, and Manitoba reported SCN for the first time in 2017.

The nematode is simply ignored because it typically doesn’t trigger apparent aboveground signs for a number of years, even because it begins to instantly cut back yields. “Farmers often assume that they do not have SCN because the soybeans don’t look sick,” stated Tylka. “This is an unfortunate mistake because SCN numbers are low when the nematode is first introduced into a field, but those numbers increase steadily if left unmanaged.”

Tylka urges all soybean farmers to check their fields for the presence of SCN by soil sampling earlier than each second or third soybean crop, even when the pathogen has by no means been discovered of their fields earlier than. He additionally underscores the want for continued funding in fundamental and utilized analysis on the biology and administration of SCN by non-public trade, authorities analysis funding businesses, and soybean checkoff organizations.

His analysis group additionally strives to succeed in soybean farmers and those that advise them by way of the SCN Coalition.


Aphids are putting soybeans sooner than anticipated


More info:
Gregory L. Tylka et al, Known Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada in 2020, Plant Health Progress (2021). DOI: 10.1094/PHP-10-20-0094-BR

Provided by
American Phytopathological Society

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Soybean cyst nematode is the most damaging soybean pathogen—and it’s rapidly spreading (2021, May 4)
retrieved 4 May 2021
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