New Bacteria-Based Bug Killer Targets Chennai Mosquitoes

A recent field study in Chennai has identified a novel approach to combat malaria by targeting mosquito breeding grounds within the city's water tanks. Researchers from the ICMR-Vector Control Research Centre (VCRC) and the Greater Chennai Corporation (GCC) evaluated a biolarvicide called Natular, derived from the soil bacterium Saccharopolyspora spinosa.

Natular utilizes spinosad, a natural insecticidal compound, to effectively kill mosquito larvae at their source. The study focused on common urban breeding habitats, including overhead water tanks and domestic containers in north Chennai. Among the tested formulations, a slow-release tablet proved most effective, maintaining an 80% reduction in mosquito emergence for about nine weeks.

This innovative method holds significant potential for urban malaria vector management, especially in dense neighborhoods where Anopheles stephensi mosquitoes thrive. In 2025, Tamil Nadu reported 321 malaria cases, with Chennai accounting for 121. While GCC currently employs chemical fogging and larviciding, this biolarvicide presents a less toxic, longer-lasting alternative.

Experts emphasize that while Natular offers advantages, it complements rather than replaces essential public health measures like sanitation and engineering. The study's findings, published in Plos One, suggest a promising new direction for controlling mosquito-borne diseases in urban environments.