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<p>The present study examines the nutritional adequacy and developmental responses of fall armyworm (FAW), <i>Spodoptera frugiperda</i> larvae on multiple host plant species representing a broad spectrum of botanical families, like Poaceae, Euphorbiaceae, Fabaceae, Brassicaceae, Asteraceae, Solanaceae, and others. Nutritional indices like Relative Growth Rate (RGR), Efficiency of Conversion of Ingested and Digested Food (ECI and ECD), Approximate Digestibility (AD), and Consumption Index (CI) were conducted using gravimetric method, and these values varied significantly among these host plants. Poaceous crops particularly wheat, maize, and pearl millet supported superior larval growth, nutrient assimilation, and metabolic efficiency. Castor emerged as the most favorable host overall, with the highest ECI (37.83%), ECD (54.88%), and the lowest metabolic cost (CN = 45.12%). In contrast, crops such as mustard, safflower, and sesame showed poor nutritional suitability, marked by low conversion efficiencies and high physiological costs. Developmental biology data revealed that cassava enabled the shortest total life cycle duration (26.01&#xa0;days), while groundnut and lablab extended developmental time and reduced pupal weight. Life table parameters were calculated from individually reared larvae under controlled conditions by monitoring the larval duration and mortality in each stage. Castor emerged as the most supportive host in terms of survivorship and population growth, with cassava showed the highest reproductive potential (R₀ = 135, r = 0.189). Hosts such as groundnut and lablab imposed the greatest mortality and exhibited the lowest intrinsic growth rates. The results highlight castor and cassava as optimal hosts for FAW, while several legumes and cruciferous vegetables served as poor hosts due to suboptimal nutrient conversion and increased larval mortality. These insights are critical for pest management strategies and host plant resistance evaluations.</p>

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Nutritional indices and biology of invasive pest, Spodoptera frugiperda on multiple host plants: implications for Pest control

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Kasturi Sarmah,
  • Devayani Sarmah,
  • Rahul Borah

摘要

The present study examines the nutritional adequacy and developmental responses of fall armyworm (FAW), Spodoptera frugiperda larvae on multiple host plant species representing a broad spectrum of botanical families, like Poaceae, Euphorbiaceae, Fabaceae, Brassicaceae, Asteraceae, Solanaceae, and others. Nutritional indices like Relative Growth Rate (RGR), Efficiency of Conversion of Ingested and Digested Food (ECI and ECD), Approximate Digestibility (AD), and Consumption Index (CI) were conducted using gravimetric method, and these values varied significantly among these host plants. Poaceous crops particularly wheat, maize, and pearl millet supported superior larval growth, nutrient assimilation, and metabolic efficiency. Castor emerged as the most favorable host overall, with the highest ECI (37.83%), ECD (54.88%), and the lowest metabolic cost (CN = 45.12%). In contrast, crops such as mustard, safflower, and sesame showed poor nutritional suitability, marked by low conversion efficiencies and high physiological costs. Developmental biology data revealed that cassava enabled the shortest total life cycle duration (26.01 days), while groundnut and lablab extended developmental time and reduced pupal weight. Life table parameters were calculated from individually reared larvae under controlled conditions by monitoring the larval duration and mortality in each stage. Castor emerged as the most supportive host in terms of survivorship and population growth, with cassava showed the highest reproductive potential (R₀ = 135, r = 0.189). Hosts such as groundnut and lablab imposed the greatest mortality and exhibited the lowest intrinsic growth rates. The results highlight castor and cassava as optimal hosts for FAW, while several legumes and cruciferous vegetables served as poor hosts due to suboptimal nutrient conversion and increased larval mortality. These insights are critical for pest management strategies and host plant resistance evaluations.