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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 100, No. 7, 2005, pp. 795-797
Bioline Code: oc05166
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 100, No. 7, 2005, pp. 795-797

 en A new black fly isolate of Bacillus thuringiensis check for this species in other resources autoagglutinating strain highly toxic to Simulium pertinax check for this species in other resources (Kollar) (Diptera, Simuliidae) larvae
Clara FG Cavados; Rodrigo N Fonseca; Jeane Q Chaves; Carlos JPC Araújo-Coutinho & Leon Rabinovitch

Abstract

Formulations containing the entomopathogenic Bacillus thuringiensis check for this species in other resources serovar israelensis strain IPS-82 has been widely applied for mosquito control around the world. Strain IPS-82 is highly active against Aedes aegypti check for this species in other resources but less active against other well-known vectors such as Culex quinquefasciatus check for this species in other resources and Simulium spp. larvae. Eighteen strains of B. thuringiensis were isolated from Simulium pertinax larvae naturally occurring in rivers of Southeast Brazil with one demonstrating special toxic effects. Simulated field tests against S. pertinax larvae showed that the native Brazilian autoagglutinanting B. thuringiensis (LFB-FIOCRUZ 1035) has an LC50 at least 25 times lower than the standard IPS-82 strain. The same bacterial preparation was also tested against Ae. aegypti larvae in laboratory trials and the LC50 values obtained with LFB-FIOCRUZ 1035 were at least three times lower than the one for the IPS 82 strain. The results indicate that this strain is more toxic than the standard B. thuringiensis serovar israelensis (H14) in the two Dipteran species tested. It is noteworthy that differences between LC50 values were more pronounced in S. pertinax larvae, the source of the original isolation.

Keywords
entomopathogenic bacteria - biological control - black fly

 
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