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<p>Mosquito resistance to chemical insecticides, the cornerstone of current vector control strategies, continues to undermine disease prevention efforts. We have developed a stable non-live larvicidal microbial biopesticide pellet formulation of <i>Chromobacterium</i> species Panama (<i>Csp_P</i>) that effectively attracts larvae and demonstrates potent activity against a broad range of mosquito disease vectors by exerting toxicity to all stages from eggs to adults upon exposure in the larval aquatic environment. Larval ingestion of <i>Csp_P</i> pellets causes irreversible midgut tissue damage, disrupting development from the larval stage and reducing the fitness and vector competence of surviving adults. The observed midgut pathology differs from that induced by conventional biopesticides and is accompanied by molecular markers of stress-mediated apoptosis and autophagy. These findings provide mechanistic insights into <i>Csp_P</i>-induced larval killing and highlight the potential of this formulation as a biologically derived, scalable tool for integrated mosquito management programs.</p>

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A broad-spectrum Chromobacterium biolarvicide formulation disrupts mosquito development through gut damage and apoptotic cell death and compromises vector competence

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月25日

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  • Vandana Vandana,
  • Madhavinadha Prasad Kona,
  • George Dimopoulos

摘要

Mosquito resistance to chemical insecticides, the cornerstone of current vector control strategies, continues to undermine disease prevention efforts. We have developed a stable non-live larvicidal microbial biopesticide pellet formulation of Chromobacterium species Panama (Csp_P) that effectively attracts larvae and demonstrates potent activity against a broad range of mosquito disease vectors by exerting toxicity to all stages from eggs to adults upon exposure in the larval aquatic environment. Larval ingestion of Csp_P pellets causes irreversible midgut tissue damage, disrupting development from the larval stage and reducing the fitness and vector competence of surviving adults. The observed midgut pathology differs from that induced by conventional biopesticides and is accompanied by molecular markers of stress-mediated apoptosis and autophagy. These findings provide mechanistic insights into Csp_P-induced larval killing and highlight the potential of this formulation as a biologically derived, scalable tool for integrated mosquito management programs.