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<p>This study compared the life-history traits and host-plant interactions of <i>Tetranychus merganser</i> and <i>T. urticae</i>. It provides a comprehensive assessment of both species by integrating taxonomic, demographic, and host plant interaction data. Morphological identification based on the shape of the aedeagus was supported by molecular analysis of partial COI sequences. Morphometric analyses revealed that all aedeagal structures and several somatic measurements were significantly larger in <i>T. merganser</i> males, whereas <i>T. urticae</i> females had longer and wider idiosomal dimensions. Demographically, <i>T. merganser</i> exhibited a significantly longer developmental time across most immature stages and higher adult survivorship, indicating slower development compared with <i>T. urticae</i>, while <i>T. merganser</i> showed greater mean generation and doubling times, reflecting slower population growth but longer longevity. The total number of eggs laid per female and sex ratios did not differ significantly between species, although both were strongly female-biased. Host-plant experiments demonstrated species-specific preferences, <i>T. urticae</i> attained higher populations and caused greater foliar damage on rose, while <i>T. merganser</i> performed better on pepper. Overall, these results highlight clear ecological differentiation between <i>T. merganser</i> and <i>T. urticae</i>, supporting their status as an important pest species with differing life-history and host-plant adaptation strategies.</p>

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Morphology, biology and plant host damage comparison between Tetranychus merganser and Tetranychus urticae (Acari: Tetranychidae)

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Sarai Corona-Sánchez,
  • Ma. Teresa Santillán-Galicia,
  • Esteban Rodríguez-Leyva,
  • Manuel Alejandro Tejeda-Reyes,
  • Nicacio Cruz-Huerta

摘要

This study compared the life-history traits and host-plant interactions of Tetranychus merganser and T. urticae. It provides a comprehensive assessment of both species by integrating taxonomic, demographic, and host plant interaction data. Morphological identification based on the shape of the aedeagus was supported by molecular analysis of partial COI sequences. Morphometric analyses revealed that all aedeagal structures and several somatic measurements were significantly larger in T. merganser males, whereas T. urticae females had longer and wider idiosomal dimensions. Demographically, T. merganser exhibited a significantly longer developmental time across most immature stages and higher adult survivorship, indicating slower development compared with T. urticae, while T. merganser showed greater mean generation and doubling times, reflecting slower population growth but longer longevity. The total number of eggs laid per female and sex ratios did not differ significantly between species, although both were strongly female-biased. Host-plant experiments demonstrated species-specific preferences, T. urticae attained higher populations and caused greater foliar damage on rose, while T. merganser performed better on pepper. Overall, these results highlight clear ecological differentiation between T. merganser and T. urticae, supporting their status as an important pest species with differing life-history and host-plant adaptation strategies.