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Pathogenicity of chilean isolates of Beauveria bassiana to adults of Asynonychus cervinus (Coleoptera: Curculionidae)

Andrés France1, Marcos Gerding1 y Alicia Sandoval1

Four native isolates of Beauveria bassiana were evaluated for food consumption and mortality over time against adults of Asynonychus cervinus (Boh.) through inoculation at different concentrations (0-108 conidia mL-1). The results indicated that food intake of insects treated with B. bassiana decreased linearly, reducing 70% consumption after 35 days. As to mortality, no differences were observed among the four isolates, all were lethal for A. cervinus and the deadliness increased with the concentrations of the isolate. From the mortality curves, the lethal concentrations LC50 and LC90 were calculated, and the best isolate (Qu-B299) had values of 1x104.7 and 1x108.3 conidia mL-1, respectively.

Key words: biological control, curculionids, entomopathogens, fungi.

1 Instituto de Investigaciones Agropecuarias, Centro Regional de Investigaciones Quilamapu, Casilla 426, Chillán, Chile. E-mail: afrance@inia.cl

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