Identification of entomo-pathogenic fungi of Atta sexdens in a silvopastoral system
DOI:
https://doi.org/10.57201/ieuna2323340Keywords:
beauveria, biocontrol, insect traps, Metharhizium, YsaúAbstract
Ysaú leaf cutter ants (Atta sexdens) are social insects made up of a queen, soldiers, workers, gardeners and drones, forming a well-organized nest that is difficult to manage and/or control. In Paraguay, in the last decade, it has become an important invasive pest for both forestry and agricultural crops. The objective of this research was to identify entomopathogenic fungi (HE) in the area of influence of nests, located in commercial silvopastoral plots of Urochloa brizantha MG-5 and Eucalyptus sp. The methodology to isolate HE was the use of insect traps or baits based on queen ants, collected and installed during the nuptial flight season of the ant nests. Soil samples from the silvopastoral plots and grass roots (U. brizantha) were used. They were also isolated from collected dead insects. The data generated on the incidence of fungal insects were subjected to analysis of variance and the means were subjected to Tukey's test. The comparison of the populations of leaf-cutter ants was carried out using the non-parametric Kruskal-Wallis test for independent samples, whose results showed that there were no significant differences between nests for the fungal ants variable (H=2.463; p>0 .05) and for the variable, deceased from other causes (H=3.806; p>0.05). The entomopathogenic fungi identified were Beauveria bassiana and Metarhizium sp. isolated from mycorrhizal cutter ants obtained from the area of influence of nests in a silvopastoral system.
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Copyright (c) 2023 Gloria Arminda Resquín-Romero, Humberto Sarubbi-Orue, Fanni Petrona Ruiz-Samudio, Sergio Manuel Chamorro-Diaz, Mirtha Vera de Ortiz, Katarzyna Golan; Inmaculada Garrido-Jurado (Autor/a)
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