Controle da sa?va mata-pasto Atta bisphaerica e sa?va lim?o Atta sexdens rubropilosa atrav?s dos fungos entomopatog?nicos Metarhizium anisopliae e Beauveria bassiana

• Autor(a) principal: Castilho, Alzimiro Marcelo Conteiro
• Data de Publicação: 2005
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/tede/853
• topic: fungo entomopatog?nico; controle microbiano; Atta bisphaerica; Atta sexdens rubropilosa; Entomopathogenic fungi; microbial control; Microbiologia

This survey was carried out under laboratory and field conditions for evaluating the efficiency of entomopathogenic fungi to control the ants Atta sexdens rubropilosa and Atta bisphaerica. The isolates from Agronomy National school (Escola Nacional de Agronomia) ENA1, ENA2, ENA3 and ENA4 of Metarhizium anisopliae as well as the isolates ENA6, ENA7, ENA13 and ENA14 of Beauveria bassiana were tested and inoculated on soldiers ants. After to have been collected, the soldiers were separated by groups of 10 individuals and wetted on a conidia suspension of 1.0 x 106 to 1.0 x 1011 conidia/ml .Each ants group was placed on a wet chamber and kept under no feeding condition at 27 ? 1 0C. Both fungi were pathogenic , although the isolates ENA 4 of Metarhizium anisopliale and ENA 6 and ENA 13 of Beauveria bassiana were considered the most virulent ones for A. bisphaerica, and for A. sexdens rubropilosa the isolates ENA 4 of Metarhizium anisopliae and ENA 14, ENA 13 and ENA 6 of Beauveria bassiana among the tested ones as well .The greatest mortality percentage was performed by these isolates with Lethal time (LT50) of 1.15 days for the isolate ENA 4, 1.39 days for ENA 6 and 1.44 days for ENA 13 ,for A. bisphaerica soldiers. For A. sexdens rubropilosa the Lethal time (LT50) was 1.37 days for the isolate ENA 4, 1.68 days for ENA 14, 1.95 days for ENA 13 and 2.14 days for ENA 6. In regard to the mortality index, the percentage of dead soldiers at the tested concentrations ranged from 45% to 71,67% . The isolates ENA 4, ENA 14, ENA 13, and ENA 6 caused the greater soldiers mortality averages in a shorter time period. The isolates ENA 4 and ENA 14 were applied by pulverization and spraying over plus 3 years old adult ants nests and 30 days after the entomopathogenic fungi application there still was some activity on the underground galleries.