Field and semi-field evaluation of Bacillus thuringiensis var. israelensis versus Temephos® in Aedes aegypti control<br>Avaliação de campo e simulado de campo de Bacillus thuringiensis var. israelensis versus Temephos® no controle de Aedes aegypti

Autores

  • Jose Bento Pereira Lima Laboratório de Fisiologia e Controle de Artrópodes Vetores Instituto Oswaldo Cruz - Fiocruz
  • Maria Goreti Rosa-Freitas Laboratório de Mosquitos Transmissores de Hematozoários - Instituto Oswaldo Cruz - Fiocruz
  • Cynara Melo Rodovalho Laboratório de Fisiologia e Controle de Artrópodes Vetores - Instituto Oswaldo Cruz - Fiocruz Laboratório de Entomologia, Instituto de Biologia do Exército
  • Ima Aparecida Braga Ministério da Saúde Secretaria Municipal de Saúde de São Domingos do Prata

DOI:

https://doi.org/10.12662/2317-3076jhbs.v4i2.695.p65-74.2016

Palavras-chave:

Vector Control, Aedes aegypti. Bti. Temephos®, Insecticide persistence

Resumo

Introduction: Aedes aegypti  is a vector of the important arboviruses worldwide. Vector control continues to rely mainly on fighting immature stages. Resistance to the larvicide Temephos® was detected in many regions of Brazil since 2000 what led control programs to search for alternative products, such as Bacillus thuringiensis var. israelensis (Bti). Caicó municipality (Rio Grande do Norte State, Brazil) was one of the first cities to use Bti. However, after some time, Bti low persistence was noticed as jeopardizing effective vector control. Objective: To compare the efficacy of two Bti granulate formulations, Vectobac G® and Vectobac WDG® and Temephos® against Ae. aegypti in field and semi-field conditions. Methods: Field tests were carried out in two neighbouring  areas which presented Ae. aegypti infestation indices >3%: Walfredo Gurgel and Boa Passagem, Caicó, RGN, Brazil, in 2004. Semi- field tests were performed in the patio of a building. Results: For the field conditions, mortality rates >80% were maintained for 14 days, average. After nine weeks, positive containers for Ae. aegypti in the field were >10% in the area of application of Bti and <1% in the area where Temephos® was applied. In the semi-field conditions Ae. aegypti larval mortality >80% was maintained for up to 56 days for Temephos®, 35 days for Vectobac G® and 49 days for Vectobac WDG®. Conclusions: The results point out to low Bti persistence in the field, mainly for containers exposed to sunlight. Local climatic and environmental conditions should be regarded when new products are tested due to high regional variability prevailing in Brazil. 

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Biografia do Autor

Jose Bento Pereira Lima, Laboratório de Fisiologia e Controle de Artrópodes Vetores Instituto Oswaldo Cruz - Fiocruz

Entomologia, malacologia de parasitos Vetores

Maria Goreti Rosa-Freitas, Laboratório de Mosquitos Transmissores de Hematozoários - Instituto Oswaldo Cruz - Fiocruz

ORCID 0000-0002-9512-6567

Publicado

2016-06-29