Spatial distribution of entomopathogenic nematodes and their relationship with soil chemical attributes in tropical agroecosystems

Abstract

The distribution of entomopathogenic nematodes (EPNs) in agricultural soils is influenced by complex interactions between edaphic factors and crop management practices, yet these relationships remain poorly understood under tropical conditions. This study evaluated the spatial distribution of EPNs and their association with soil chemical attributes in five crop systems in southeastern Brazil. A total of 82 soil samples were collected and analyzed using insect-baiting techniques and geospatial tools, including kernel density and interpolation methods. EPN occurrence varied across crops and was positively associated with higher concentrations of potassium and iron, while an inverse pattern was observed for copper. These results suggest that micronutrients may indirectly influence EPN distribution by modulating soil microbial communities and plant–soil interactions. Although causal relationships cannot be definitively established, the spatial patterns identified highlight the importance of soil chemical composition in structuring beneficial soil fauna. The integration of geospatial analysis provides a valuable framework for optimizing the application of biological control agents in Integrated Pest Management (IPM) programs. These findings contribute to a better understanding of soil ecological dynamics and support the development of more sustainable agricultural practices.

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