Patterns of occurrence and activity of Entomopathogenic Fungi in the Algarve (Portugal) using different isolation methods

Entomopathogenic fungi (EPF) are distributed in natural and agricultural soils worldwide. To investigate EPF occurrence in different botanical habitats and soil-ecoregions, we surveyed 50 georeferenced localities in the spring of 2016 across the Algarve region (South Portugal). Additionally, we compared three EPF isolation methods: insect baiting in untreated or pre-dried-soil and soil dilution plating on a selective medium. We hypothesized that forest habitats (oak and pine semi-natural areas) and the acidic soil ecoregion may favor EPF occurrence. Overall, EPF species were present in 68% of sites, widely distributed throughout the Algarve. The use of selective media resulted in higher recovery of EPF than did either soil-baiting method. Contrary to our hypothesis, neither vegetation type nor ecoregion appeared to influence EPF occurrence. Traditional and molecular methods confirmed the presence of five EPF species. Beauveria bassiana (34% of sites), was the most frequently detected EPF, using pre-dried soil baiting and soil dilution methods. However, baiting untreated soil recovered Fusarium solani more frequently (26% of sites), demonstrating the utility of using multiple isolation methods. We also found Fusarium oxysporum, Purpureocillium lilacinum and Metarhizium anisopliae in 14%, 8% and 2% of the sites, respectively. Three abiotic variables (pH, soil organic matter and Mg) explained 96% of the variability of the entomopathogen community (EPF and entomopathogenic nematodes) in a canonical correspondence analysis, confirming the congruence of the soil properties that drive the assemblage of both entomopathogens. This study expands the knowledge of EPF distribution in natural and cultivated Mediterranean habitats.

Bibliographic Details

Main Authors:	Bueno-Pallero, Francisco Ángel, Blanco-Pérez, Rubén, Vicente-Díez, Ignacio, Rodríguez Martín, José Antonio, Dionísio, Lídia, Campos-Herrera, R.
Other Authors:	Fundação para a Ciência e a Tecnologia (Portugal)
Format:	artículo biblioteca
Language:	English
Published:	Multidisciplinary Digital Publishing Institute 2020-06-04
Subjects:	Biologic control, Entomopathogenic organisms, Habitat preference, Mediterranean agroecosystems, Multivariate analysis,
Online Access:	http://hdl.handle.net/10261/213558 http://dx.doi.org/10.13039/501100001871 http://dx.doi.org/10.13039/501100003329
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