2021
Screening Soybean PI Lines for Resistance to Meloidogyne enterolobii and Investigating Nematode Suppression through Cover Crop Varieties
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Contributor/Checkoff:
North Carolina Soybean Producers Association
Category:
Sustainable Production
Keywords:
NematodePest
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Adrienne Gorny, North Carolina State University
Co-Principal Investigators:
Project Code:
21-111
Contributing Organization (Checkoff):
North Carolina Soybean Producers Association
$9,000
Institution Funded:
North Carolina State University
$9,000
Brief Project Summary:
Meloidogyne enterolobii is an introduced root-knot nematode species to North Carolina. It has a broad host range including many vegetables, field crops, and weeds, and causes severe root galling. It is more aggressive than the other species found here, and management is difficult, as it appears to increase population densities to damaging levels even with fumigation. Previous research resulted in no resistance being found. This project screens selected PI lines with known resistance to other root-knot nematode species and soybean cyst nematode to assess potential mechanisms for resistance and identify the sensitivity of soybean lines to this new root-knot nematode. The project also screens several cover crops for their host status and effectiveness in suppressing this nematode.
Key Beneficiaries:
#agronomists, #extension agents, #farmers
Unique Keywords:
#nematode, #nematodes, #rkn, #root-knot nematode, #variety trials
Information And Results
Project Summary

Meloidogyne enterolobii is an introduced root-knot nematode species to North Carolina. This species has a broad host range (including many vegetables, field crops, and weeds) and threatens profitable soybean production in this state by causing severe root galling. M. enterolobii is more aggressive than the other endemic root-knot nematode species found in NC. Management of this species through cultural and chemical control is difficult, as it appears to increase population densities to damaging levels even with fumigation. Chemical controls for general nematode control in soybean are limited due to the costs of application and the limited economic return with their application. Identification of varietal resistance is important to continue to economically produce soybean with this pest continuing to spread in North Carolina. Previous screening of the Official Variety Test soybean varieties resulted in no resistance to M. enterolobii being found. This project will screen selected PI lines (n=80) with known resistance to other root-knot nematode species and the soybean cyst nematode to assess potential mechanisms for resistance as well as identify the sensitivity of soybean lines to this new root knot nematode. In addition to identifying resistant varieties, nematodes are frequently managed through cover cropping with non-hosts. Several small grain cover crops have been reported as resistant or non-host to M. enterolobii, however the utility of using cover crops to suppress M. enterolobii is not well understood. This project will screen several NC cover crops for their host status to M. enterolobii as well as their effectiveness in suppressing M. enterolobii in soil, thus providing a benefit to a following soybean crop.

Project Objectives

1.) Screen diverse soybean PI accessions (n=80) with known, established resistance to other root-knot nematode species (i.e. M. incognita, M. arenaria, M. hapla, and M. javanica) or soybean cyst nematode (Heterodera glycines) to assess for additional resistance to M. enterolobii.

2.) Screen cover crops grown in NC for their ability to suppress M. enterolobii and quantify the suppressive effect.

3.) Develop outreach and extension materials in the form of disease factsheets and video segments related to M. enterolobii and other nematode management concepts in soybean.

Project Deliverables

Progress Of Work

Final Project Results

Benefit To Soybean Farmers

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.