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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 100, No. 4, 2005, pp. 431-434
Bioline Code: oc05108
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 100, No. 4, 2005, pp. 431-434

 en Development of a Bacillus sphaericus check for this species in other resources tablet formulation and its evaluation as a larvicide in the biological control of Culex quinquefasciatus check for this species in other resources
Flávia P. Morais de Medeiros; Maria Alice Varjal de Melo Santos; Leda Regis; Eugênia M. Maranhão Rios & Pedro J. Rolim Neto

Abstract

This study aimed to analyze the final fermentation culture of Bacillus sphaericus check for this species in other resources 2362, standardize it and develop an active tablet formulation for use in urban mosquito breeding sites. It was performed in three phases: analysis and standardization of a B. sphaericus fermented culture; physical, chemical, and biological analysis of the active powder (solubility, residual humidity, particle size, resting angle, flowing off time, compacted density, and biological activity against Culex quinquefasciatus check for this species in other resources larvae); and the development of fast-disintegrating tablets. Five formulations with differing compositions were developed and a UV protector was added to the selected formulation. The formulation products with or without UV protector, as well as the active powder caused 100% larval mortality from 1 day to 2 months after a single treatment under simulated field conditions. These results show that the UV protector does not affect the initial larvicide activity of B. sphaericus, nor its persistence over a period of two months.

Keywords
Bacillus sphaericus - Culex quinquefasciatus - larvicide - tablets

 
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