2022
Investigating Additive Effects of Ragweed Extract and Mycorrhizae in Managing Soybean Cyst Nematode
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Contributor/Checkoff:
South Dakota Soybean Research and Promotion Council
Category:
Sustainable Production
Keywords:
NematodePest
Parent Project:
Investigating Alternative Nematicides and Continued Grower Education for Improved Soybean Cyst Nematode Management
Lead Principal Investigator:
Emmanuel Byamukama, South Dakota State University
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
South Dakota Soybean Research and Promotion Council
$54,991
Institution Funded:
South Dakota State University
$54,991
Brief Project Summary:
The soybean cyst nematode is difficult to manage because it inhabits the soil and can survive up to 10 years without a host, therefore it is not practically possible to eradicate SCN. Management of SCN requires a concerted effort that includes grower awareness, use of resistant/tolerant soybean cultivars, supplemented by nematicide seed treatments where SCN population density in the soil is high. Researchers will offer free SCN testing for SD soybean producers with this project. Additionally, they will evaluate the effects of ragweed extract seed coat and arbuscular mycorrhizae, additives that have been shown to reduce SCN infestation, as well as a new commercial nematicide seed treatment, Saltro.
Key Beneficiaries:
#agronomists, #extension specialists, #farmers
Unique Keywords:
#nematodes, #scn, #soil testing, #soybean cyst nematodes
Information And Results
Project Summary

The soybean cyst nematode (SCN) continues to be the most important soybean production constraint in South Dakota. SCN is difficult to manage because it inhabits the soil and can survive up to 10 years without a host, therefore it is not practically possible to eradicate SCN. However, SCN can be managed to keep the population density below damaging levels. Management of SCN requires a concerted effort that includes grower awareness, use of resistant/tolerant soybean cultivars, supplemented by nematicide seed treatments where SCN population density in the soil is high. We propose to continue to offer free SCN testing for SD soybean producers with funding support for this project. We propose to evaluate the additive effects of ragweed extract seed coat and arbuscular mycorrhizae, two additives that have been independently shown to reduce SCN infestation in soybean roots. We will also evaluate the possible additive effects in combination with a new commercial nematicide seed treatment, Saltro. The activities proposed in this grant will result in increased grower awareness of SCN and verification of additives to the soil and seed are likely to improve SCN management.

Project Objectives

1. Continue supporting SD producers to test their soils for SCN
2. Determine the efficacy of ragweed extract against SCN as seed additive
3. Determine the additive effects of ragweed extract and arbuscular mycorrhizae fungi (AMF) on SCN management
4. Determine the additive effects of ragweed extract with Saltro, a new nematicide seed treatment on SCN management

Project Deliverables

• Growers test their soils for SCN and receive information on management strategies specific to
their fields.
• Potential of ragweed extract as a seed additive determined.
• Additive effects of ragweed extract with arbuscular myhorrhizae and Salto fungicide
determined.

Progress Of Work

Updated February 3, 2022:
See attached report

View uploaded report Word file

Updated February 3, 2022:
See attached report

View uploaded report Word file

Final Project Results

Benefit To Soybean Farmers

Continued SCN awareness and promotion of SCN testing will be offered through the university extension website, radio talks, social media, field days, newspapers, and SD Soybean Leader publication. Progress of this project will be regularly communicated to the stakeholders via extension articles, and quarterly reports.

Soybean producers in South Dakota will be afforded the opportunity to submit soil samples for free SCN testing of their fields. This will allow producers to determine if they have SCN infestations, giving them the chance to implement management strategies to limit damage and control SCN on their fields.

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.