Known Distribution of the Soybean Cyst Nematode, Heterodera glycines, in the United States and Canada in 2020

Abstract

In the United States and Canada, the most damaging pathogen of soybean, Glycine max, is the soybean cyst nematode (SCN), Heterodera glycines. Plant health professionals working for universities and state and provincial departments of agriculture in the United States and Canada are queried periodically about counties and rural municipalities that are newly known to be infested with SCN in their states and provinces. Such a census was conducted in 2020, and the results were compared with results of the most recent survey, published in 2017. Between 2017 and 2020, 55 new SCN-infested counties were reported from 11 U.S. states. Also, 24 new SCN-infested counties and rural municipalities were identified in the Canadian provinces of Manitoba, Ontario, and Quebec. A map of the known distribution of SCN in these two countries was updated. The results reveal steady expansion of the distribution of SCN throughout the United States and Canada, and the pest almost certainly will continue to spread among and within soybean-producing areas of these countries in the future. Therefore, continued scouting and soil sampling for detection of new SCN infestations are warranted as the first step toward successfully managing the pathogen.

Wheat Production Alters Soil Microbial Profiles and Enhances Beneficial Microbes in Double-Cropping Soybean

“…Besides direct losses tied to nematodes, these organisms may be part of disease complexes, often causing root system wounds, and allowing other pathogens to infect plants (Xing and Westphal, 2006;Coyne et al, 2018). In the U.S., the soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) is widely disseminated in all major soybean production areas (Tylka and Marett, 2021). SCN is a significant soybean yield-limiting factor, especially in the Midwestern U.S. (Bradley et al, 2021), and yield losses caused by SCN can reach 60% for susceptible cultivars (Hershman, 2014).…”

A Broad Review of Soybean Research on the Ongoing Race to Overcome Soybean Cyst Nematode

“…Among these is soybean cyst nematode Heterodera glycines Ichinohe, (SCN). SCN is one of the most devastating pathogens to soybean and is widely present in many areas around the world and is continuing to spread to regions of soybean production in North America [ 7 ]. Hence, it is important to study this pathogen and identify resistance genes/QTLs in soybean for use in effective management of the disease.…”

“…SCN is a plant parasitic nematode that causes major soybean yield loss (over $1.5 billion annually in the United States) [ 7 ]. It has a fully sequenced genome size of ~158 MB comprising of 9 chromosomes and about ~22,400 annotated gene models [ 8 ].…”

Epistatic interaction between Rhg1-a and Rhg2 in PI 90763 confers resistance to virulent soybean cyst nematode populations

“…Soybean cyst nematode (SCN; Heterodera glycines , Ichinohe) is a major threat to soybean production worldwide (Koenning and Wrather 2010 ; Allen et al 2017 ; Tylka and Marett 2021 ). The monetary loss for soybean producers caused by SCN from 1996 through 2016 is estimated to be $32 billion with more than $1.5 billion in yield losses annually in the USA (Bandara et al 2020 ).…”