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<p>The fall armyworm is the most destructive invasive insect pest affecting maize in India. Among the various control measures, host plant resistance is regarded as the most economical and environmentally sustainable strategy in the long term. The present study aims to standardise an ear-damage-based screening technique by introducing FAW larval loads of 2, 5, and 10 into each ear, determining key ear traits associated with resistance, and characterising antibiosis resistance using FAW survival and developmental parameters across diverse maize lines. The proposed screening technique involves assessing ear damage ratings (EDR) on a scale of 1 to 9 by comparing cob damage levels among maize genotypes. The results indicated that exposing maize genotypes at the milking stage to five-day-old FAW larvae at a rate of five larvae per ear would enable differentiation among the genotypes as resistant, moderately resistant, susceptible, and highly susceptible based on the EDR. The present study successfully identified resistant-CML336, and moderately resistant genotypes-CML337, CML141, and CML71, based on EDR evaluations. Key husk traits, including the number of husk layers, husk extension from the tip of the ear, and husk tightness, collectively contribute to resistance against ear damage caused by FAW in maize. The resistant and moderately resistant genotypes exhibited the highest levels of antibiosis resistance, leading to detrimental effects on key biological parameters of FAW. The findings of this study substantially contribute to the selection of genotypes for breeding resistance to FAW in maize.</p>

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Ear-feeding resistance offers new insights into host plant resistance to fall armyworm Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in maize

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • P. Lakshmi Soujanya,
  • K. R. Yathish,
  • Chikkappa Gangadhar Karjagi,
  • G. Nikitha Reddy,
  • Bhupender Kumar,
  • J. C. Sekhar,
  • H. S. Jat

摘要

The fall armyworm is the most destructive invasive insect pest affecting maize in India. Among the various control measures, host plant resistance is regarded as the most economical and environmentally sustainable strategy in the long term. The present study aims to standardise an ear-damage-based screening technique by introducing FAW larval loads of 2, 5, and 10 into each ear, determining key ear traits associated with resistance, and characterising antibiosis resistance using FAW survival and developmental parameters across diverse maize lines. The proposed screening technique involves assessing ear damage ratings (EDR) on a scale of 1 to 9 by comparing cob damage levels among maize genotypes. The results indicated that exposing maize genotypes at the milking stage to five-day-old FAW larvae at a rate of five larvae per ear would enable differentiation among the genotypes as resistant, moderately resistant, susceptible, and highly susceptible based on the EDR. The present study successfully identified resistant-CML336, and moderately resistant genotypes-CML337, CML141, and CML71, based on EDR evaluations. Key husk traits, including the number of husk layers, husk extension from the tip of the ear, and husk tightness, collectively contribute to resistance against ear damage caused by FAW in maize. The resistant and moderately resistant genotypes exhibited the highest levels of antibiosis resistance, leading to detrimental effects on key biological parameters of FAW. The findings of this study substantially contribute to the selection of genotypes for breeding resistance to FAW in maize.