Japanese Soil Bacterium Offers New Hope Against Corn Rootworm
A soil bacterium discovered in Japan is paving the way for a new biopesticide technology aimed at combating one of corn's most persistent pests, the corn rootworm. The bacterium, Burkholderia rinojensis A396, was first isolated in 2008 near Rinoji Temple in Nikko, Japan. Its fermentation products have since been developed into a crop-protection platform designed for commercial agriculture, offering a different mode of action compared to traditional synthetic insecticides and genetically engineered traits.
The technology works by growing the bacterium through fermentation to produce pesticidal compounds, which are then inactivated and formulated into a shelf-stable product. This approach allows for lower application rates and broader-acre production, moving microbial crop protection from specialized markets to mainstream agriculture. The U.S. Environmental Protection Agency (EPA) has already included 'Inactivated Burkholderia rinojensis strain A396 Cells and Spent Fermentation Media' in its list of biopesticide active ingredients, with registration slated for 2025.
The timing of this technology is significant as corn rootworm remains a major challenge for U.S. corn growers. The pest's adaptability and resistance to existing management tactics necessitate new strategies to preserve the effectiveness of current tools. Iowa State University's 2026 monitoring effort highlighted the importance of scouting and field-specific decisions, with 11.6% of continuous corn sites reaching critical beetle pressure thresholds compared to just 3% in rotated fields.
The development of this biopesticide coincides with advancements in agricultural biotechnology, such as the deregulation of MON 95275 corn in March 2026. This genetically engineered corn is designed to resist feeding damage from corn rootworm, illustrating the concurrent progress of multiple technology pathways against the same agronomic problem. The new biological approach, however, must prove its efficacy, reliability, and cost-effectiveness against established systems to gain grower acceptance.