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Simulium spp. control program in Rio Grande do Sul, Brazil.

L B Mardini1, M A Torres, G L da Silveira

  • 1Coordenação de Política de Controle de Zoonoses e Vetores, Secretaria de Saúde, Av. Borges de Medeiros 727-6o andar, 90020-025 Porto Alegre, RS, Brasil. luciabeatriz@terra.com.br

Memorias Do Instituto Oswaldo Cruz
|January 6, 2001
PubMed
Summary

Simuliidae (black flies) control in Rio Grande do Sul shifted from chemical to biological larvicides due to resistance. Bacillus thuringiensis israelensis is now used, protecting millions and improving public health.

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Area of Science:

  • Public Health
  • Entomology
  • Environmental Science

Background:

  • Simuliidae (black flies) pose significant public health and economic challenges in Rio Grande do Sul.
  • Previous chemical control methods led to insect resistance, necessitating alternative strategies.

Purpose of the Study:

  • To evaluate the implementation and impact of biological control for Simuliidae in Rio Grande do Sul.
  • To transition from ineffective chemical larvicides to sustainable biological control methods.

Main Methods:

  • Implementation of a new outflow measuring method for larvicide application.
  • Introduction and widespread use of Bacillus thuringiensis serovar israelensis (Bti) as a biological larvicide.
  • Application of Bti across 36.4% of the state's affected area.

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Main Results:

  • Successful shift to biological control using Bti, overcoming chemical resistance issues.
  • Protection of approximately 3,500,000 inhabitants through integrated pest management.
  • Reduced socio-economic and public health impacts associated with Simuliidae attacks.

Conclusions:

  • Biological control with Bti, coupled with improved application methods, is an effective strategy against Simuliidae.
  • The transition has significantly improved public health and economic conditions in affected regions.
  • Sustainable pest management is crucial for long-term control of disease vectors.