ArticleActa parasitologica2025
Characterization and Biocontrol Efficacy of a New Isolate of Steinernema abbasi (Elawad Ahmad & Reid, 1997) Against Spodoptera litura (Fabricius) and Mythimna separata (Walker).
Article in Acta parasitologica, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeEntomopathogenic nematodes are promising biocontrol agents offering environmentally sustainable alternatives to chemical insecticides. The present study aimed to isolate, identify, and evaluate the bioefficacy of a new Steinernema sp. DA-1 isolate from a forest ecosystem in Bihar, India, with potential application in the management of major lepidopteran pests.
methodsA new isolate of S. abbasi was recovered through Galleria baiting from soil samples. Morphological and morphometric analyses were conducted to confirm its identity, followed by molecular characterization using the Internal Transcribed Spacer region marker. Phylogenetic relationships were analyzed to determine genetic divergence from other known S. abbasi isolates. Laboratory bioefficacy assays were conducted against different larval instars (3rd, 4th, and 5th) of Mythimna separata and Spodoptera litura. Average time taken to kill and LD
resultsMorphological, morphometric, and molecular analyses confirmed the identity of the isolate as S. abbasi. Phylogenetic analysis placed it within the S. abbasi clade, showing subtle genetic divergence, indicating local adaptation, except for certain isolates (accession no. KR029837, KR029836, KR029837), which exhibited high divergence. Bioefficacy assays demonstrated significant dose- and age-dependent mortality in both M. separata and S. litura. LD
conclusionThis study provides the first validated report of S. abbasi from Bihar, India, revealing its strong virulence against major lepidopteran pests under laboratory conditions. These findings highlight its potential as a biological control agent, warranting further pot and field evaluations before its possible inclusion in regional sustainable pest management programs.
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