科研之友
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摘要
A broca da cana-de-a 迆car Diatraea saccharalis F. 谷 considerada uma das principais pragas nas Am谷ricas. Entre os m谷todos de controle, o uso de fungos entomopatog那nicos tem sido amplamente recomendado no manejo das pragas da cana-de-a 迆car, incluindo outras lepidobrocas. Assim sendo, este estudo investigou os efeitos de diferentes concentra es de Beauveria bassiana (Bals.) Vuill. e Metarhizium anisopliae (Metsch.) Sorok. sobre parametros biol車gicos da broca da cana-de-a 迆car. Larvas de terceiro instar de D. saccharalis foram tratadas com os fungos usando as concentra es de 103, 104 e 105 con赤dios mL-1. Larvas tratadas com 105 con赤dios mL-1 de B. bassiana tiveram menor sobreviv那ncia (56,6%), comparadas com lagartas n o-tratadas (90%). Adultos originados de larvas tratadas colocaram menor n迆mero de ovos, com menor viabilidade, e viveram menos, comparados com adultos originados de larvas n o-tratadas. Larvas tratadas com M. anisopliae na concentra o de 105 con赤dios mL-1 e adultos originados destas larvas tamb谷m exibiram redu o no desempenho, comparados aos insetos n o-tratados. Os resultados indicam que B. bassiana e M. anisopliae, al谷m de patog那nicos 角slarvas de D. saccharalis, tamb谷m interferem negativamente na sua biologia, mostrando potencial de uso contra esta praga. The sugarcane borer Diatraea saccharalis F. is considered oneof 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 differentconcentrations of Beauveria bassiana (Bals.) Vuill and Metarhizium anisopliae (Metch.) Sorok on biological characteristics of the sugarcane borer. Third-instar larvae of D. saccharalis werefungi-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 presentedreduced 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.
