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<p>The fall armyworm (FAW) (<i>Spodoptera frugiperda</i> J. E. Smith) is a major invasive insect pest of maize, causing severe economic losses globally. Host plant resistance is a key component of the integrated pest management strategies to manage FAW. The present study screened 55 diverse maize genotypes under artificial infestation to identify resistant sources under choice and no-choice conditions. The morphological traits associated with resistance to FAW were also determined. Three genotypes, viz., MIL 9-1230, MIL 9-1308, and MIL 9-1309 exhibited resistance, with a leaf damage rating (LDR) less than 4.0 both under choice and no-choice conditions. Among the morphological traits assessed, leaf thickness and internodal distance showed negative correlations with LDR, suggesting their role in resistance. On the other hand, leaf length, leaf width, plant height, and the number of nodes showed a positive correlation with LDR, indicating their association with susceptibility. Furthermore, antibiosis resistance was characterized by the survival and developmental parameters of FAW in selected genotypes by detached leaf whorl assay. FAW larvae when fed on resistant genotypes, MIL 9-1230, MIL 9-1308, and MIL 9-1309, exhibited prolonged larval duration compared to susceptible ones. Conversely, larval survival, larval weight, pupation, pupal weight, adult emergence, adult longevity, and fecundity were higher in susceptible genotypes. These findings provide valuable insights into the morphological and antibiosis-based resistance mechanisms in maize, contributing to the development of FAW-resistant genotypes for sustainable maize production.</p>

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Resistance of maize genotypes to fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • G. Nikitha Reddy,
  • P. Lakshmi Soujanya,
  • S. M. Haldhar,
  • K. R. Yathish,
  • K. I. Singh,
  • L. K. Mishra,
  • L. N. K. Singh,
  • H. S. Jat

摘要

The fall armyworm (FAW) (Spodoptera frugiperda J. E. Smith) is a major invasive insect pest of maize, causing severe economic losses globally. Host plant resistance is a key component of the integrated pest management strategies to manage FAW. The present study screened 55 diverse maize genotypes under artificial infestation to identify resistant sources under choice and no-choice conditions. The morphological traits associated with resistance to FAW were also determined. Three genotypes, viz., MIL 9-1230, MIL 9-1308, and MIL 9-1309 exhibited resistance, with a leaf damage rating (LDR) less than 4.0 both under choice and no-choice conditions. Among the morphological traits assessed, leaf thickness and internodal distance showed negative correlations with LDR, suggesting their role in resistance. On the other hand, leaf length, leaf width, plant height, and the number of nodes showed a positive correlation with LDR, indicating their association with susceptibility. Furthermore, antibiosis resistance was characterized by the survival and developmental parameters of FAW in selected genotypes by detached leaf whorl assay. FAW larvae when fed on resistant genotypes, MIL 9-1230, MIL 9-1308, and MIL 9-1309, exhibited prolonged larval duration compared to susceptible ones. Conversely, larval survival, larval weight, pupation, pupal weight, adult emergence, adult longevity, and fecundity were higher in susceptible genotypes. These findings provide valuable insights into the morphological and antibiosis-based resistance mechanisms in maize, contributing to the development of FAW-resistant genotypes for sustainable maize production.