2021
Field Evaluation of Resistance Sources for Management of Soybean Cyst Nematode
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Contributor/Checkoff:
Maryland Soybean Board
Category:
Sustainable Production
Keywords:
NematodePest
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Alyssa Koehler, University of Delaware
Co-Principal Investigators:
Project Code:
PLSC43292521016/PLSCDA2116
Contributing Organization (Checkoff):
Maryland Soybean Board
$6,180
Institution Funded:
University of Delaware
$6,180
Brief Project Summary:

Soybean cyst nematode consistently ranks as top destructive pathogen of soybeans. As the PI88788 resistance gene loses effectiveness, growers are in need of additional management tools. This project aims to screen two new resistance gene sources compared to PI88788 to monitor nematode reproduction and populations over the course of the season. As we continue to deal with breakdown of resistance gene efficacy and subsequent increases in SCN populations, the goal of this project is to obtain data on resistance gene performance to expand potential management options for farmers.

Key Benefactors:
farmers, agronomists, Extension agents

Information And Results
Project Deliverables

Findings from this project will be shared through the University of Delaware’s Weekly Crop Update which reaches over 700 growers, consultants, and stakeholders and provides a platform to discuss disease concerns and other production issues. Data will also be shared through training events and extension presentations such as Mid Atlantic Crop School, and the 2022 Delaware Ag Week. At University of Delaware hosted field days and commodity meetings, growers will be given a brief questionnaire to better understand concerns regarding nematode management and to investigate knowledge bases surrounding SCN resistance genes. In 2020, the United Soybean Board gave funding to the SCN Coalition to widen its reach to all states as data has shown that resistance gene PI88788, used in >90% of SCN-resistant soybean cultivars, is beginning to lose effectiveness. Dr. Koehler is a member of the SCN Coalition and questions used in this survey may include a set of questions released by the SCN Coalition to understand grower choices, perceptions, and
understanding of SCN host resistance

Final Project Results

Update:

View uploaded report PDF file

Soybean cyst nematode (SCN) (Heterodera glycines) is consistently ranked among the top destructive soybean pathogens across the United States and is the most significant nematode pest affecting soybeans in Delaware and the Eastern Shore of Maryland. SCN has been present in Delaware since 1979 prompting growers to rely on resistant varieties, primarily using the PI88788 resistance source. However, additional control strategies are needed as SCN populations have begun reproducing readily on these once resistant cultivars. A five-replication field trial was conducted in 2021 to evaluate two additional resistance genes, Peking and PI89772, compared to lines with PI88788, for stand emergence, control of SCN, and yield differences. Soybean maturity group had the largest impact on yield, but the PI89772 resistance gene had the lowest numerical value of SCN at the end of the season and lowest nematode reproductive factor. Further replications of this experiment will be conducted in 2022 to gain additional data on performance of these resistance genes.

Please contact Alyssa Koehler (akoehler@udel.edu) with any additional questions.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.