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A broca da cana-de-açúcar Diatraea saccharalis F. é considerada uma das principais pragas nas Américas. Entre os métodos de controle, o uso de fungos entomopatogênicos tem sido amplamente recomendado no manejo das pragas da cana-de-açúcar, incluindo outras lepidobrocas. Assim sendo, este estudo investigou os efeitos de diferentes concentrações de Beauveria bassiana (Bals.) Vuill. e Metarhizium anisopliae (Metsch.) Sorok. sobre parâmetros biológicos da broca da cana-de-açúcar. Larvas de terceiro instar de D. saccharalis foram tratadas com os fungos usando as concentrações de 103, 104 e 105 conídios mL-1. Larvas tratadas com 105 conídios mL-1 de B. bassiana tiveram menor sobrevivência (56,6%), comparadas com lagartas não-tratadas (90%). Adultos originados de larvas tratadas colocaram menor número de ovos, com menor viabilidade, e viveram menos, comparados com adultos originados de larvas não-tratadas. Larvas tratadas com M. anisopliae na concentração de 105 conídios mL-1 e adultos originados destas larvas também exibiram redução no desempenho, comparados aos insetos não-tratados. Os resultados indicam que B. bassiana e M. anisopliae, além de patogênicos às larvas de D. saccharalis, também interferem negativamente na sua biologia, mostrando potencial de uso contra esta praga. The sugarcane borer Diatraea saccharalis F. is considered one of the major sugarcane pests in the American continent. Among control methods, the use of entomopathogenic fungi has been broadly recommended to manage sugarcane pests, including other sugarcane borers. Therefore, this study investigated the effects of different concentrations of Beauveria bassiana (Bals.) Vuill and Metarhizium anisopliae (Metch.) Sorok on biological characteristics of the sugarcane borer. Third-instar larvae of D. saccharalis were fungi-treated using the concentrations of 103, 104 and 105 conidia mL-1. Larvae treated with 105 conidia mL-1 of B. bassiana showed lower survival (56.6%) compared to untreated larvae (90%). Adults originated from treated larvae laid a lower number of eggs and exhibited lower viability, and lived less compared to adults of untreated larvae. Also, larvae treated with 105 conidia mL-1 of M. anisopliae and adults originated from those larvae presented reduced performance compared to untreated larvae. Results indicate that B. bassiana and M. anisopliae are pathogenic to D. saccharalis larvae and affect its biology. Hence, they have potential to be used against this pest

acta scientiarum. biological sciences

Efeito de &lt;em&gt;Beauveria bassiana&lt;/em&gt; (Bals.) Vuill. e &lt;em&gt;Metarhizium anisopliae&lt;/em&gt; (Metsch.) Sorok. sobre características biológicas de &lt;em&gt;Diatraea saccharalis&lt;/em&gt; F. (Lepidoptera: Crambidae)