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<p>Egg size contributes to the quality of egg parasitoids produced for biological control. Parasitoids emerging from larger host eggs are bigger, more fecund, longer-lived and have higher host location success. In this study, we evaluated <i>Ephestia kuehniella</i> Zeller, 1879 (Lepidoptera: Pyralidae) egg size at different temperatures and the relationship between egg size and parasitoid size. <i>Ephestia kuehniella</i> larvae were reared on an artificial diet at 25&#xa0;°C, and pupae and adults were reared at 20&#xa0;°C, 22.5&#xa0;°C and 25&#xa0;°C. Eggs were collected and photographed, and the photos were used to estimate egg size as a cross-sectional area. <i>Trichogramma pretiosum</i> Riley, 1879 (Hymenoptera: Trichogrammatidae) and <i>Trichogramma galloi</i> Zucchi, 1988 were mounted on slides for microscopy. Mounted specimens were photographed, and the photos were used to measure their ovipositors and wings and the relationship between the largest parasitoid and host egg size was evaluated. <i>Ephestia kuehniella</i> egg size increases as temperature decreases. At the same temperature, egg size slightly decreased over the day. We conclude that larger eggs are produced at 20&#xa0;°C, and large parasitoid emerge from large host eggs, but this relationship is not ubiquitous.</p>

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Lower Temperatures Promote Egg Size Increase in Ephestia kuehniella (Lepidoptera: Pyralidae)

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Diego de Souza,
  • Geraldo Andrade Carvalho,
  • Lucas Del Bianco Faria

摘要

Egg size contributes to the quality of egg parasitoids produced for biological control. Parasitoids emerging from larger host eggs are bigger, more fecund, longer-lived and have higher host location success. In this study, we evaluated Ephestia kuehniella Zeller, 1879 (Lepidoptera: Pyralidae) egg size at different temperatures and the relationship between egg size and parasitoid size. Ephestia kuehniella larvae were reared on an artificial diet at 25 °C, and pupae and adults were reared at 20 °C, 22.5 °C and 25 °C. Eggs were collected and photographed, and the photos were used to estimate egg size as a cross-sectional area. Trichogramma pretiosum Riley, 1879 (Hymenoptera: Trichogrammatidae) and Trichogramma galloi Zucchi, 1988 were mounted on slides for microscopy. Mounted specimens were photographed, and the photos were used to measure their ovipositors and wings and the relationship between the largest parasitoid and host egg size was evaluated. Ephestia kuehniella egg size increases as temperature decreases. At the same temperature, egg size slightly decreased over the day. We conclude that larger eggs are produced at 20 °C, and large parasitoid emerge from large host eggs, but this relationship is not ubiquitous.