2019
Evaluating Resistant Soybean Varieties and Seed Treatments to Help Iowa Farmers Maintain High Yields in SCN Infested Fields
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Contributor/Checkoff:
Iowa Soybean Association
Category:
Sustainable Production
Keywords:
NematodePest
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Gregory Tylka, Iowa State University
Co-Principal Investigators:
Project Code:
450-46-09
Contributing Organization (Checkoff):
Iowa Soybean Association
$165,824
Leveraged Funding (Non-Checkoff):
For the 2018 growing season, $21,600 was obtained from BASF to support experiments with their soon-to-be-released seed treatment Trunemco. These funds, and approximately $30,000 of other private industry funds, paid for personnel and other costs for the project.
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Institution Funded:
Iowa State University
$165,824
Brief Project Summary:

Not all resistant soybean varieties control soybean cyst nematode equally. No legal definition or industry standard of SCN control is required for varieties to claim SCN resistance. Similarly, no minimum level of SCN control is required for nematode-protectant seed treatments. These field experiments provide data on the effects of SCN-resistant soybean varieties and nematode-protectant seed treatments on SCN reproduction and soybean yields. Work intends to assess and study the agronomic performance and nematode control provided by SCN-resistant soybean varieties, the effects of increasing SCN reproduction on yields of SCN-resistant soybean varieties and the effects of nematode-protectant seed treatments on agronomic performance and reproduction of SCN on resistant soybean varieties.

Key Benefactors:
farmers, agronomists, Extension agents

Information And Results
Final Project Results

Update:
- Received seed from seed and seed-treatment companies for 2019 field experiments, designed the 2019 field experiments, and packaged and organized the seeds for the various experiments. The varieties included in the 2019 SCN-resistant soybean variety trial experiments are from ASGROW, Beck’s, Cornelius, Corteva (Pioneer), Federal, GROWMARK FS HiSoy, Hoegemeyer, Kruger, Latham, LG Seeds, Legacy Seeds, Merschman, MFA Incorporated, Mycogen, NuTech, Nutrien Ag Solutions (Dyna-Gro), Stine, and Syngenta (NK).

- Set up, planted, soil sampled, and maintained nine field experiments located throughout Iowa to evaluate the yield enhancement and nematode control provided by 186 SCN-resistant soybean varieties. Some experiments didn't get planted until June 2019 because of wet weather. The latest experiment was planted June 10, 2019.

- Set up, planted, soil sampled, and maintained nine field experiments located throughout Iowa to evaluate the agronomic performance and nematode control provided by three different nematode-protectant seed treatments - namely Aveo (from Valent), Nemastrike (from Bayer), and Trunemco (from NuFarm).

- Extracted SCN cysts (egg-filled dead SCN females), then eggs, from soil samples collected from all 9 resistant variety evaluation experiments and the 27 seed treatment experiments to determine initial SCN egg population densities.

- In late September, began trimming the field research plots at the 36 variety evaluation and seed treatment experiments in preparation for harvesting. Harvest likely will begin the week of October 14, 2019.

- In late August, contacted more than 50 seed companies and gathered information about SCN-resistant soybean varieties to use to update the ISU Extension publication titled “Soybean Cyst Nematode-Resistant Soybean Varieties for Iowa”. This publication will be compiled and released in PDF format by the end of October 2019.

- Submitted a manuscript of a research paper that was accepted by the journal Plant Disease that summarizes three years of coordinated ISA On-Farm Network and ISU small-plot experiments evaluating the agronomic benefit and nematode control provided by Ilevo seed treatment (ISA scientists Peter Kyveryga and Tristan Mueller are co-authors). The manuscript will include yield difference graphs (with versus without Ilevo) using Iowa Soybean Association’s online ISOFAST tool.

View uploaded report PDF file

View uploaded report 2 PDF file

Currently there are three options for managing SCN: 1) growing nonhost crops such as corn, 2) growing SCN-resistant soybean varieties, and 3) using nematode-protectant seed treatments on soybean seeds. Annually, the results of the experiments conducted in this project are useful to Iowa soybean farmers in deciding which resistant varieties and seed treatments to purchase for use in fields infested with SCN. The results of the experiments conducted in 2019 are not yet available because the plots have not been harvested by the date of this report (30 September 2019). The report of 2018 variety trial experimental results and the 2018 list of SCN-resistant soybean varieties for Iowa are attached to this final report.

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.