Natural occurrence of Beauveria bassiana (Bals.) Vuill. in hibernating adults of Oebalus poecilus (Dallas) (Hemiptera: Pentatomidae)

RÉGIS S.S. SANTOS HONÓRIO F. PRANDO LUIZA R. REDAELLI LÚCIA M.G. DIEFENBACH HELENA P. ROMANOWSKIi About the authors

Hibernating adults of Oebalus poecilus (Dallas) were collected from May to December of 2000, in a bamboo thicket located in Eldorado do Sul County (30º 02' S e 51º 23' W), RS. The fungi isolation was done from dead insects, which presented a white micelial growth, in PDA culture medium. The pathogenicity of the isolate was tested in laboratory conditions using three concentrations of conidium suspension (5 x 10(5); 5 x 10(7); 1.25 x 10(9) conidia/ml). The fungus was identified as Beauveria bassiana (Bals.) Vuill. and was deposited in a culture collection of entomopathogenic fungi in Embrapa Soja with access number Bb353. The isolate was pathogenic in all concentrations, being the highest mortality (84.4%) recorded in 1.25 x 10(9) conídios/ml concentration. This is the first record of this fungus on O. poecillus, in natural conditions.

Insecta; fungi; entomopathogen; small rice stink bug


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