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<p>To assess whether the potential host plant ranges of the two sympatric pierid species <i>Eurema mandarina</i> (de l’Orza, 1869) and <i>Eurema laeta</i> (Boisduval, 1836) (Lepidoptera: Pieridae) are determined by host plant suitability for larval development, we experimentally examined larval survival and developmental performance on four leguminous plant species. <i>Eurema mandarina</i> is a common generalist species that feeds on different leguminous plants, including both arboreous and herbaceous species, whereas <i>E. laeta</i> is an endangered specialist species that feeds primarily on <i>Chamaecrista nomame</i>. All <i>E. mandarina</i> individuals died when reared on <i>C. nomame</i>, primarily during the first instar stage. Among the successfully emerging <i>E. mandarina</i> individuals, the larval period was shorter, the pupae were heavier, and the rate of growth was higher on <i>Albizia julibrissin</i> and <i>Lespedeza cuneata</i> than on <i>Aeschynomene indica</i>. In contrast, <i>E. laeta</i> developed well on <i>C. nomame,</i> but invariably died on the other three assessed plant species during the hatchling stage. These findings indicate that <i>E. laeta</i> specializes on <i>C. nomame</i>, which is unsuitable for the co-existing <i>E. mandarina</i>, with these differences being determined by the intrinsic suitability of host plants for larval development.</p>

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Survival and performance of the larvae of two sympatric butterflies, Eurema mandarina and Eurema laeta (Lepidoptera: Pieridae), on four Fabaceae plant species

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Ryotaro Okada,
  • Suzuki Noriyuki

摘要

To assess whether the potential host plant ranges of the two sympatric pierid species Eurema mandarina (de l’Orza, 1869) and Eurema laeta (Boisduval, 1836) (Lepidoptera: Pieridae) are determined by host plant suitability for larval development, we experimentally examined larval survival and developmental performance on four leguminous plant species. Eurema mandarina is a common generalist species that feeds on different leguminous plants, including both arboreous and herbaceous species, whereas E. laeta is an endangered specialist species that feeds primarily on Chamaecrista nomame. All E. mandarina individuals died when reared on C. nomame, primarily during the first instar stage. Among the successfully emerging E. mandarina individuals, the larval period was shorter, the pupae were heavier, and the rate of growth was higher on Albizia julibrissin and Lespedeza cuneata than on Aeschynomene indica. In contrast, E. laeta developed well on C. nomame, but invariably died on the other three assessed plant species during the hatchling stage. These findings indicate that E. laeta specializes on C. nomame, which is unsuitable for the co-existing E. mandarina, with these differences being determined by the intrinsic suitability of host plants for larval development.