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<p>Host plant resistance is an effective approach to manage insect pests in vegetable crops. This approach involves the use of plant traits that deter or reduce insect feeding and reproduction involving the mechanisms of antibiosis, antixenosis, and tolerance. These traits affect plant–insect interactions through the production of metabolites and volatiles, which can modify insect behavior and physiology. Invasive black flower thrips, <i>Thrips parvispinus</i> (Karny) (Thysanoptera: Thripidae) is a recently invaded and highly polyphagous pest causing severe damage to chilli (<i>Capsicum</i> spp.) and other crops in India and worldwide. Despite of its quarantine importance, limited studies exist on the biochemical factors influencing its infestation dynamics on different chilli hybrids. There is a need to determine various biochemical and nutrient factors influencing the chilli resistance to thrips infestation. To investigate these parameters around 33 chilli hybrids were screened for resistance to <i>T. parvispinus</i> at Mandya, Karnataka, during Rabi 2023 to Summer 2024 among them, 13 hybrids representing different resistance levels to thrips infestation were selected for further biochemical and nutrient analysis. The biochemical analysis of chilli leaves revealed that infestation levels were positively correlated with soluble sugars, reducing sugars, and crude protein content, indicating that nutrient-rich tissues favour thrips growth. Conversely, defensive phytochemicals such as total phenols, free amino acids, and tannins showed strong negative correlations with thrips infestation, suggesting their role in host resistance by deterring feeding and reproduction. These findings provide insights into the biochemical nutrient basis of host susceptibility and resistance, supporting the development of chilli hybrids with enhanced defensive traits and contributing to integrated pest management (IPM) strategies against <i>T. parvispinus</i>.</p>

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Investigation on host plant resistance mechanisms in chilli against invasive black thrips, Thrips parvispinus (Karny) (Thysanoptera: Thripidae)

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Gaurav Vinod Rao Sadafale,
  • Vijaykumar Lingaraj,
  • Raveendra Haldodderi Rangaswamy,
  • Shivaray Navi,
  • Somu Gopalanayaka,
  • Kiran Kumar Narayanaswamy,
  • Nagesh Malasiddappa Chikkarugi

摘要

Host plant resistance is an effective approach to manage insect pests in vegetable crops. This approach involves the use of plant traits that deter or reduce insect feeding and reproduction involving the mechanisms of antibiosis, antixenosis, and tolerance. These traits affect plant–insect interactions through the production of metabolites and volatiles, which can modify insect behavior and physiology. Invasive black flower thrips, Thrips parvispinus (Karny) (Thysanoptera: Thripidae) is a recently invaded and highly polyphagous pest causing severe damage to chilli (Capsicum spp.) and other crops in India and worldwide. Despite of its quarantine importance, limited studies exist on the biochemical factors influencing its infestation dynamics on different chilli hybrids. There is a need to determine various biochemical and nutrient factors influencing the chilli resistance to thrips infestation. To investigate these parameters around 33 chilli hybrids were screened for resistance to T. parvispinus at Mandya, Karnataka, during Rabi 2023 to Summer 2024 among them, 13 hybrids representing different resistance levels to thrips infestation were selected for further biochemical and nutrient analysis. The biochemical analysis of chilli leaves revealed that infestation levels were positively correlated with soluble sugars, reducing sugars, and crude protein content, indicating that nutrient-rich tissues favour thrips growth. Conversely, defensive phytochemicals such as total phenols, free amino acids, and tannins showed strong negative correlations with thrips infestation, suggesting their role in host resistance by deterring feeding and reproduction. These findings provide insights into the biochemical nutrient basis of host susceptibility and resistance, supporting the development of chilli hybrids with enhanced defensive traits and contributing to integrated pest management (IPM) strategies against T. parvispinus.