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<p><i>Conogethes punctiferalis</i> (Guenée) (Lepidoptera: Crambidae) is a major pest affecting various cultivated plants, including castor (<i>Ricinus communis</i> L.). While chemical control remains the primary management strategy, host plant resistance offers an eco-friendly alternative, particularly as part of an integrated pest management (IPM) approach. This study aimed to assess resistance mechanisms (antixenosis and antibiosis) in five resistant and five susceptible castor genotypes against <i>C. punctiferalis</i> under laboratory conditions using no-choice and multi-choice assays. Significant differences were observed among genotypes in oviposition, larval development time, survival rate, larval and pupal weight, pupal duration, adult emergence, and adult longevity. The genotypes RG-2466, RG-1930, and RG-2774 exhibited antixenosis based on reduced oviposition, whereas DPC-9 showed notable antibiosis (reduced larval survival, prolonged development, and lower larval and pupal weights). Genotype 48–1 expressed both mechanisms. These genotypes may serve as valuable genetic resources for breeding capsule borer-resistant castor varieties.</p>

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Deciphering the mechanisms of resistance to Conogethes punctiferalis (Guenée) in castor

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • R. Sathishkumar,
  • P. Duraimurugan,
  • S. D. Nehru,
  • S. Senthilvel

摘要

Conogethes punctiferalis (Guenée) (Lepidoptera: Crambidae) is a major pest affecting various cultivated plants, including castor (Ricinus communis L.). While chemical control remains the primary management strategy, host plant resistance offers an eco-friendly alternative, particularly as part of an integrated pest management (IPM) approach. This study aimed to assess resistance mechanisms (antixenosis and antibiosis) in five resistant and five susceptible castor genotypes against C. punctiferalis under laboratory conditions using no-choice and multi-choice assays. Significant differences were observed among genotypes in oviposition, larval development time, survival rate, larval and pupal weight, pupal duration, adult emergence, and adult longevity. The genotypes RG-2466, RG-1930, and RG-2774 exhibited antixenosis based on reduced oviposition, whereas DPC-9 showed notable antibiosis (reduced larval survival, prolonged development, and lower larval and pupal weights). Genotype 48–1 expressed both mechanisms. These genotypes may serve as valuable genetic resources for breeding capsule borer-resistant castor varieties.