Project Details:

Title:
Assessing nematode control and yield of SCN-resistant soybean varieties in response to different soybean cyst nematode populations (Hg types)

Parent Project: Assessing nematode control and yield of SCN-resistant soybean varieties in response to different SCN populations (Hg types)
Checkoff Organization:Iowa Soybean Association
Categories:Insects and pests, Nematodes, Education
Organization Project Code:
Project Year:2014
Lead Principal Investigator:Gregory Tylka (Iowa State University)
Co-Principal Investigators:
Leonor Leandro (Iowa State University)
Keywords: Soybean Cyst Nematode (SCN), Soybean Variety Testing

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

The overall goal of the project is to provide Iowa soybean growers with a regular source of unbiased and complete information about the agronomic performance and soybean cyst nematode (SCN) control provided by soybean varieties marketed to Iowa growers as resistant to SCN. The existing ISU SCN-resistant Soybean Variety Trial Program will be expanded into a more comprehensive program for evaluation of a greater number of SCN-resistant soybean varieties sold in Iowa.

Not all soybean varieties described as resistant to the soybean cyst nematode (SCN) are truly resistant to the pathogen. In fact, some "SCN-resistant" varieties are completely susceptible, allowing unchecked SCN reproduction. Growing a soybean variety that is marketed as "SCN resistant" but allows high levels of SCN reproduction could result in disastrous yield losses and explosive increases in SCN egg population densities that will persist for many years to come. This project provides comprehensive, accurate, and unbiased information about how well soybean varieties marketed as "SCN-resistant" function in suppressing nematode population densities and how well the varieties yield in SCN-infested fields in Iowa. The project also is revealing the relationship between SCN population HG types (formerly called SCN races) and yield loss on SCN-resistant soybean varieties with the different sources of resistance.

Project Objectives

1. Compile information each year about soybean varieties marketed as resistant to SCN that are available to Iowa farmers.
2. Assess each year the amount of SCN reproduction on the roots of SCN-resistant soybean varieties using SCN populations from Iowa fields in short-term greenhouse experiments under controlled environmental conditions.
3. Assess the agronomic performance each year of SCN-resistant soybean varieties in experiments conducted in fields infested with different SCN HG types at various locations throughout Iowa.
4. Measure each year the control of SCN population densities provided by SCN-resistant soybean varieties in experiments conducted in fields infested with different SCN HG types at various locations throughout Iowa.

Project Deliverables

Progress of Work

Final Project Results

In the past six months, we compiled and published a list of SCN-resistant soybean varieties for Iowa. The publication was made available online on the Production Research section of www.iasoybeans.com and also on the ISU Extension Online Store.

The final two of three 30-day greenhouse experiments were completed to precisely assess the amount of SCN reproduction that occurred on SCN-resistant soybean varieties that were tested in the ISU SCN-resistant Soybean Variety Trial Program in 2013. In the fall of 2013, we harvested all of the plots at the nine variety trial experiments, and soil samples were collected from each plot to determine end-of-season SCN egg population densities. Once yields and SCN egg population densities were determined and statistically analyzed, results were compiled into a publication that was printed in December 2013 and distributed to 70,000 Iowa farmers and agribusiness personnel in January 2014 in the Iowa Farmer Today. To prepare for the 2014 growing season, more than 100 different seed companies in January-February 2014 were invited to nominate SCN-resistant soybean varieties that they sell to Iowa farmers to include in the 2014 ISU SCN-resistant Soybean Variety Trial Program. Also, we sought out SCN-resistant soybean varieties with Peking and Hartwig sources of SCN resistance that were not submitted for testing in the variety trials by the seed companies. The varieties for evaluation in 2014 were selected and seed was obtained.

Benefit to Soybean Farmers

Performance Metrics

Project Years

YearProject Title (each year)
2015Assessing nematode control and yield of SCN-resistant soybean varieties in response to different SCN populations (Hg types)
2014Assessing nematode control and yield of SCN-resistant soybean varieties in response to different soybean cyst nematode populations (Hg types)
2013Assessing nematode control and yield of SCN-resistant soybean varieties in response to different soybean cyst nematode populations (Hg types)
2012Assessing nematode control and yield of SCN-resistant soybean varieties in response to different soybean cyst nematode populations (Hg types)
2011Assessing nematode control and yield of SCN-resistant soybean varieties in response to different SCN populations (Hg types)
2010Assessing nematode control and yield of SCN-resistant soybean varieties in response to different SCN populations (Hg types)