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<p>Pulse beetles (<i>Callosobruchus</i> spp.) are among the most destructive pests of stored legumes, causing substantial quantitative and qualitative losses during storage. Information on the distribution, host preference and demographic performance of different <i>Callosobruchus</i> species is essential for understanding their pest status and developing effective management strategies. The present investigation was undertaken to determine the distribution of <i>Callosobruchus</i> species in major pulse-growing districts of Himachal Pradesh, evaluate the orientation behaviour of adults towards different pulse hosts, and compare the demographic performance of <i>C. chinensis</i>, <i>C. maculatus</i> and <i>C. analis</i> using female age-specific life-table analysis. Field surveys conducted during 2022–2024 revealed that <i>C. chinensis</i> was the most widely distributed species, followed by <i>C. maculatus</i>, whereas <i>C. analis</i> exhibited a comparatively restricted distribution. Free-choice orientation assays demonstrated distinct interspecific differences in host preference, with <i>C. chinensis</i> showing maximum attraction towards mung bean, <i>C. maculatus</i> towards kabuli chickpea, and <i>C. analis</i> towards chickpea and cowpea. Comparative life-table analyses further indicated marked variation in demographic performance among pulse hosts. Mung bean supported the highest reproductive potential and population growth of <i>C. chinensis</i>, whereas chickpea and kabuli chickpea were the most favourable hosts for <i>C. maculatus</i>, and horse gram and cowpea supported superior demographic performance of <i>C. analis</i>. Rajma consistently proved to be the least suitable host for all three species. By integrating species distribution, host orientation behaviour and comparative demographic performance within a single investigation, this study provides a broader ecological understanding of host utilization by economically important <i>Callosobruchus</i> species under stored-grain conditions. The findings provide an integrated understanding of species distribution, host orientation and demographic performance, thereby generating information useful for host-based pest risk assessment and the development of integrated management strategies for stored pulses.</p>

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Distribution, host orientation and comparative demographic performance of three Callosobruchus species (Coleoptera: Chrysomelidae) on stored pulse hosts

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Vasu Mehta,
  • RS Chandel

摘要

Pulse beetles (Callosobruchus spp.) are among the most destructive pests of stored legumes, causing substantial quantitative and qualitative losses during storage. Information on the distribution, host preference and demographic performance of different Callosobruchus species is essential for understanding their pest status and developing effective management strategies. The present investigation was undertaken to determine the distribution of Callosobruchus species in major pulse-growing districts of Himachal Pradesh, evaluate the orientation behaviour of adults towards different pulse hosts, and compare the demographic performance of C. chinensis, C. maculatus and C. analis using female age-specific life-table analysis. Field surveys conducted during 2022–2024 revealed that C. chinensis was the most widely distributed species, followed by C. maculatus, whereas C. analis exhibited a comparatively restricted distribution. Free-choice orientation assays demonstrated distinct interspecific differences in host preference, with C. chinensis showing maximum attraction towards mung bean, C. maculatus towards kabuli chickpea, and C. analis towards chickpea and cowpea. Comparative life-table analyses further indicated marked variation in demographic performance among pulse hosts. Mung bean supported the highest reproductive potential and population growth of C. chinensis, whereas chickpea and kabuli chickpea were the most favourable hosts for C. maculatus, and horse gram and cowpea supported superior demographic performance of C. analis. Rajma consistently proved to be the least suitable host for all three species. By integrating species distribution, host orientation behaviour and comparative demographic performance within a single investigation, this study provides a broader ecological understanding of host utilization by economically important Callosobruchus species under stored-grain conditions. The findings provide an integrated understanding of species distribution, host orientation and demographic performance, thereby generating information useful for host-based pest risk assessment and the development of integrated management strategies for stored pulses.