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Background <p>Polyphagous stored grain pests, such as <i>Sitophilus oryzae</i>, <i>Callosobruchus chinensis</i>, <i>Sitotroga cerealella</i>, <i>Rhyzopertha dominica</i> and <i>Trogoderma granarium</i> are expanding their host ranges. Therefore, life table studies of these pests were conducted on green gram, since they have shown potential to infest this legume.</p> Results <p>The metabolites present in green gram were profiled, which led to differences in population growth among the pests. The immature period was longest in <i>R. dominica</i>, followed by <i>S. cerealella</i>, <i>T. granarium</i>, <i>S. oryzae</i> and <i>C. chinensis</i>. In contrast, <i>S. oryzae</i> greatly outlived the other four in terms of adult longevity. Population parameters, such as potential fecundity, gross reproductive rate and net reproductive rate, were highest in <i>S. oryzae</i>, while population growth rate and population size of the 2nd generation were highest in <i>R. dominica</i>. Meanwhile, the intrinsic rate of increase and finite rate of increase were highest in <i>C. chinensis</i>. These parameters were observed to be lowest in either <i>T. castaneum</i> or <i>S. cerealella</i>. We found direct correlations between host metabolites and the growth of the pest population.</p> Conclusion <p>The susceptibility of the green gram cultivar was found to be decreasing in the order of <i>S. oryzae</i> &gt; <i>R. dominica</i> &gt; <i>C. chinensis &gt; S. cerealella</i> &gt; <i>T. granarium</i>. Hence, protection measures need to be taken against <i>R. dominica</i>, <i>S. oryzae</i> and <i>C. chinensis</i> during storage of green gram. However, none of the tested pests completely dominated the population parameters. These findings help in modifying host metabolite profiles to improve resistance to SGPs.</p> Graphical Abstract <p></p>

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Population growth and life table studies of five polyphagous stored grain pests on green gram

  • 期刊论文

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  • 发表日期：

    2026年2月13日

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  • Neha Chowdhury,
  • Bratatee Sardar,
  • Sarmila Pal,
  • Nayan Roy

摘要

Background

Polyphagous stored grain pests, such as Sitophilus oryzae, Callosobruchus chinensis, Sitotroga cerealella, Rhyzopertha dominica and Trogoderma granarium are expanding their host ranges. Therefore, life table studies of these pests were conducted on green gram, since they have shown potential to infest this legume.

Results

The metabolites present in green gram were profiled, which led to differences in population growth among the pests. The immature period was longest in R. dominica, followed by S. cerealella, T. granarium, S. oryzae and C. chinensis. In contrast, S. oryzae greatly outlived the other four in terms of adult longevity. Population parameters, such as potential fecundity, gross reproductive rate and net reproductive rate, were highest in S. oryzae, while population growth rate and population size of the 2nd generation were highest in R. dominica. Meanwhile, the intrinsic rate of increase and finite rate of increase were highest in C. chinensis. These parameters were observed to be lowest in either T. castaneum or S. cerealella. We found direct correlations between host metabolites and the growth of the pest population.

Conclusion

The susceptibility of the green gram cultivar was found to be decreasing in the order of S. oryzae > R. dominica > C. chinensis > S. cerealella > T. granarium. Hence, protection measures need to be taken against R. dominica, S. oryzae and C. chinensis during storage of green gram. However, none of the tested pests completely dominated the population parameters. These findings help in modifying host metabolite profiles to improve resistance to SGPs.

Graphical Abstract