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Entomopathogenic nematodes improve pest control efficiency through functional modulation of root-associated microbiomes in Allium tuberosum
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DOI：10.1127/entomologia/3767.png)
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Abstract
En 中文
Entomopathogenic nematodes (EPNs) are specialized insect parasites widely used in sustainable pest management. Although EPNs are effective against soil-dwelling pests, their influence on rhizosphere microbiome assembly remains unclear. This study investigated the interactions among Steinernema feltiae SN, the pest Bradysia odoriphaga, and rhizosphere microbiome in Allium tuberosum agroecosystems. Field trials demonstrated that S. feltiae SN resulted in 84% pest control effi cacy 42 days after treatment and significantly increased crop yield. High-throughput sequencing revealed that EPNs application maintained rhizosphere microbial alpha diversity and amplicon sequence variants (ASVs) richness but altered beta diversity. Treated with EPNs exhibited decreased abundances of Actinobacteriota, Chloroflexi, Verrucomicrobiota, Entotheonellaeota, and Glomeromycota, but increased Firmicutes, Patescibacteria, Desulfobacterota, MBNT15, Campylobacterota, and Deferribacterota at phylum level. Redundancy analysis (RDA) revealed positive correlations between EPNs efficacy and bacterial genera such as Ellin6067 and Lactobacillus, as well as fungal genera including Gibberella, Hypocrea, Cylindrocarpon, and Acaulium. Functional predictions indicated a shift in bacterial functions, with enrichment in stress-responsive pathways and reduction in core metabolic processes. These findings demonstrate that EPNs can reshape rhizosphere microbial function to enhance pest control without compromising overall diversity.
Keywords:
Steinernema feltiae
Bradysia odoriphaga
biocontrol
rhizosphere
root microbial communities
integrated pest management (IPM)
chive gnats
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