Soybean field and farmer's hand

Who we are. Why we’re back.

We’re the second SCN Coalition – a diverse group of University researchers, Extension specialists and ag company representatives who are concerned about the evolving threat from soybean cyst nematode. Just like the first SCN Coalition from 1997, we’re encouraging growers to Take the Test. Beat the Pest.

What’s different this time? Because SCN is becoming resistant to the PI 88788 source of resistance (used in more than 90% of resistant varieties), we’re encouraging growers to “Know Your Number” and actively manage SCN. Our goal is to decrease SCN populations and increase yield potential. root-illustration.png

The events that led to the new SCN Coalition

Historical Events

Industry Response

1899

SCN is first discovered in northeast China

1915

SCN is first reported in the scientific literature

1952

SCN is given the scientific name Heterodera glycines by a Japanese scientist

1954

SCN is discovered in the U.S., in North Carolina

1957

First soybean breeding lines with SCN resistance (sources of SCN resistance) are reported: PI 548402 (Peking) and PI 90763

1957

SCN is discovered in the Midwestern U.S., in south-eastern Missouri

1962

PI 88788 is first reported as a source of SCN resistance

1974-2017

Numerous published disease loss estimates dating back to 1974 list SCN as most damaging soybean pathogen

1978

Bedford, the first soybean variety with PI 88788 SCN resistance, is released

1978

SCN is discovered in the upper Midwestern U.S., in southern Minnesota and northern Iowa

1987

SCN is discovered in Ontario, Canada, Michigan, and Wisconsin

1989

First report of SCN causing increased soybean sudden death syndrome (SDS) symptoms and yield loss

1990

A survey of Illinois reveals that about one fourth of SCN infestations have increased reproduction on resistance: the first published evidence that SCN is building up on PI 88788

1992

Criteria for describing soybean varieties as resistant, moderately resistant, moderately susceptible, and susceptible to SCN are published

1997

About half of 1,325 surveyed Midwestern soybean growers indicate it's important to scout for SCN, but 65% have never tested their fields for SCN

1997

The SCN Coalition is organized and launched with funding by the soybean checkoff through the North Central Soybean Research Program (NCSRP)

1998

The SCN Coalition provides training for agronomists and growers, educational materials, advertising, public relations, a website, demonstration plots and offers for free SCN soil sample processing

1999

A follow- up survey of Midwestern U.S. soybean growers two years after the 1997 survey shows 13% more growers say it's important to scout for SCN and 6% more say they have tested for SCN. University SCN resting labs report increases - from 11% to 736% - in numbers of SCN soil samples submitted

1999

The first SCN Coalition ends as funding shifts to breeding for SCN resistance

2005-2008

Surveys of Missouri, Illinois, Kentucky, Tennessee, Indiana, and Ontario, Canada, demonstrate that increasing numbers of SCN populations are reproducing at greater levels on PI 88788

2008

Standard greenhouse method - the HG type test - for assessing soybean resistance to SCN (SCE08) published

2010

First published report of relationship between high SCN and high soil pH in the field

2013

SCN is discovered in Quebec, Canada

2015

An annually updated list of SCN-resistant soybean varieties in the Upper Midwest shows nearly all (>90%) have PI 88788 source of resistance

2016

University, industry, and growers come together to discuss how to avoid another resistance crisis in agriculture similar to the herbicide resistance problem. Their decision: Build a second SCN Coalition

2016

Growers on the NCSRP board approve funds to build the second SCN Coalition. The goal: Increase the number of growers who are testing their fields and actively managing SCN

2017

Analysis of 15 years of experiments in Iowa farmers' fields show an increase in SCN reproduction on PI 88788 and an accompanying decrease in yields of resistant varieties with PI 88788

2017

Growers on the United Soybean Board (USB) approve funds to expand the SCN Coalition's reach to all soybean-producing states

2018

Yield losses will likely continue to worse as SCN reproduction on PI 88788 increases. The SCN Coalition aims to minimize future yield losses