Biological nematicide solutions using Bacillus thuringiensis and entomopathogenic nematode symbiotic bacteria for root-knot nematode control
Research-driven bio-based nematode management using Bt strains and EPN symbiotic bacteria (Xenorhabdus spp.) targeting root-knot nematodes in vegetable production. Offers a sustainable alternative to soil fumigation with demonstrated in vitro nematicidal efficacy exceeding 80% mortality against Meloidogyne incognita juveniles.
Overview
Root-knot nematodes (RKN) cause significant yield losses in vegetable crops, and traditional soil fumigation is under increasing scrutiny due to human and environmental health concerns. This research program isolates and evaluates naturally occurring nematode-antagonistic microorganisms as sustainable alternatives to chemical fumigants. The focus is on two biologically based approaches: Bacillus thuringiensis (Bt) strains producing nematicidal Cry proteins, and bacterial symbionts of entomopathogenic nematodes (EPN), particularly Xenorhabdus species. Both Bt and EPN-based products are already commercially available as environmentally safe bio-insecticides, positioning this work at the intersection of established biocontrol technology and emerging nematode management needs.
Technical specifications
Target pest: Root-knot nematode (Meloidogyne incognita), with emphasis on second-stage juveniles (J2).
Biological agents under evaluation:
- Bacillus thuringiensis strains producing toxic Cry proteins with nematicidal activity
- Xenorhabdus bovienii metabolites derived from Steinernema feltiae
- Xenorhabdus cabanillasii as an additional EPN symbiotic bacterium
Validated efficacy: In vitro bioassays demonstrated that X. bovienii metabolites caused greater than 80% mortality of M. incognita J2.
Planned greenhouse validation protocol:
- Model crop: tomato
- Application methods: soil drench
- Application rates: low and high concentrations
- Application timing: 10 days before transplanting and at transplant
- Evaluation metrics: plant growth performance, phytotoxicity, root galling, and nematode reproduction
- Assessment timing: 800 degree days using a 10 °C base temperature
Technology readiness level
The technology is at an early-to-mid stage of development. Initial in vitro bioassays have demonstrated promising nematicidal activity, with unpublished data supporting the approach. The next critical validation step is a controlled greenhouse study to optimize application rates and timing for vegetable production systems, particularly tomato. Further field-scale validation and formulation development would be required before commercial deployment. The underlying Bt and EPN bacterial agents already have a commercial track record as bio-insecticides, which lowers regulatory and production risk relative to entirely novel biocontrol agents.
About University of Georgia
The University of Georgia is a comprehensive public land‑grant research university serving a large student body across multiple campuses, known for applied scholarship and community partnership. Industry partners access core facilities and pilot‑scale capabilities—including the Food Product Innovation and Commercialization Center—for prototyping, scale‑up, and product validation. A downtown Innovation District and a statewide Cooperative Extension network link campus expertise to companies across Georgia, while proximity to Atlanta’s corporate and logistics hubs lowers barriers to engagement. Research is supported by competitive federal funding from agencies such as NIH, NSF, USDA, and DOE. A dedicated technology transfer office provides IP services, licensing, startup support, and incubator space to accelerate commercialization.
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