A new black fly isolate of Bacillus thuringiensis autoagglutinating strain highly toxic to Simulium pertinax (Kollar) (Diptera, Simuliidae) larvae
Mem. Inst. Oswaldo Cruz
;
100(7): 795-797, Nov. 2005.
Article
Dans Anglais
| LILACS, SES-SP
| ID: lil-419709
RESUMO
Formulations containing the entomopathogenic Bacillus thuringiensis serovar israelensis strain IPS-82 has been widely applied for mosquito control around the world. Strain IPS-82 is highly active against Aedes aegypti but less active against other well-known vectors such as Culex quinquefasciatus 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.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Simuliidae
/
Bacillus thuringiensis
/
Toxines bactériennes
/
Lutte biologique contre les nuisibles
/
Aedes
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Mem. Inst. Oswaldo Cruz
Thème du journal:
Médecine tropicale
/
Parasitologie
Année:
2005
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Fundacão Oswaldo Cruz/BR
/
Secretaria de Saúde do Estado de São Paulo/BR
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