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Enhancing Reniform Nematode Management in Sweetpotato by Complementing Host-Plant Resistance with Nonfumigant
Md Shah Alam1, Churamani Khanal2, Joseph Roberts3
1Department of Entomology and Nematology, University of California Davis, Davis, CA 95616.
Plant Disease
|January 12, 2024
Summary
Researchers identified resistant sweetpotato varieties to combat reniform nematode (Rotylenchulus reniformis) damage. Combining these resistant plants with nonfumigant nematicides offers a sustainable strategy for nematode management in sweetpotato crops.
Area of Science:
- Plant Pathology
- Nematology
- Agronomy
- Crop Science
Background:
- Reniform nematode (Rotylenchulus reniformis) significantly reduces sweetpotato yield and quality.
- Current management strategies like host resistance, fumigants, and crop rotation are insufficient or problematic.
- Effective and environmentally safer methods are urgently needed for reniform nematode control in sweetpotatoes.
Purpose of the Study:
- To screen sweetpotato plant introductions (PIs) for resistance to reniform nematode.
- To evaluate the efficacy of nonfumigant nematicides in combination with resistant PIs.
- To identify sustainable management strategies for reniform nematode in sweetpotato production.
Main Methods:
- Screened 24 sweetpotato PIs against R. reniformis.
- Identified resistant and moderately resistant PIs.
- Tested combinations of selected resistant PIs with nonfumigant nematicides (oxamyl, fluopyram, fluensulfone).
Main Results:
- Four PIs showed resistance, and 10 showed moderate resistance to R. reniformis.
- Specific PIs (e.g., PI 595869, PI 153907, PI 599386) significantly suppressed nematode egg production (83-89%).
- Nonfumigant nematicides reduced nematode reproduction by 34-93%, with oxamyl being most effective.
Conclusions:
- Resistant sweetpotato PIs can be valuable resources for breeding programs.
- Combining host plant resistance with nonfumigant nematicides enhances nematode control.
- This integrated approach offers a promising path towards sustainable reniform nematode management.
