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<p><i>Kriechbaumerella dendrolimi</i> Sheng &amp; Zhong, 1986 is a dominant pupal parasitoid of <i>Dendrolimus houi</i> de Lajonquière, 1980, a major defoliating pest afflicting coniferous forests in southern China. The efficiency of mass rearing directly influences its effectiveness in biological control programs. This study investigated reproductive modes, reproductive system anatomy, mating behaviours, and key factors influencing fecundity. Results revealed that <i>K. dendrolimi</i> exhibits both arrhenotokous parthenogenesis and sexual reproduction, with highly significant differences in offspring sex ratios between these reproductive modes (<i>P</i> &lt; 0.001). Males mated an average of 12 times during their lifespan and required 1.94 ± 0.92 courtship attempts per successful copulation. Mean courtship duration was 171.37 ± 115.81&#xa0;s, while copulation lasted 85.66 ± 21.75&#xa0;s. Females, in contrast, mated only once during their lifetime. Females possess paired ovaries typically containing 5–7 polytrophic ovarioles per ovary, with a maximum ovarian egg load of 97.3 ± 6.37 eggs per female, indicating a synovigenic reproductive strategy. Temperature, female age, and parasitoid-to-host ratios significantly influenced reproductive output. Adult longevity was highest at 20&#xa0;°C. Ten-day-old females exhibited the highest parasitism rate (80.71% ± 8.16%), whereas five-day-old females produced the greatest number of offspring. Inoculation using 5–10-day-old females at 25&#xa0;°C with a parasitoid-to-host ratio of 10:20 effectively improved mass-rearing efficiency.</p>

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Reproductive Traits and Key Factors Affecting the Fecundity of Kriechbaumerella dendrolimi Sheng & Zhong, 1986 (Hymenoptera: Chalcididae)

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Qiufang Zheng,
  • Lingzhi Zheng,
  • Qunda Chen,
  • Zhenhui Zhao,
  • Xingying Li,
  • Zesui Chen,
  • Yican Zheng,
  • Ruijie Chen,
  • Guanghong Liang

摘要

Kriechbaumerella dendrolimi Sheng & Zhong, 1986 is a dominant pupal parasitoid of Dendrolimus houi de Lajonquière, 1980, a major defoliating pest afflicting coniferous forests in southern China. The efficiency of mass rearing directly influences its effectiveness in biological control programs. This study investigated reproductive modes, reproductive system anatomy, mating behaviours, and key factors influencing fecundity. Results revealed that K. dendrolimi exhibits both arrhenotokous parthenogenesis and sexual reproduction, with highly significant differences in offspring sex ratios between these reproductive modes (P < 0.001). Males mated an average of 12 times during their lifespan and required 1.94 ± 0.92 courtship attempts per successful copulation. Mean courtship duration was 171.37 ± 115.81 s, while copulation lasted 85.66 ± 21.75 s. Females, in contrast, mated only once during their lifetime. Females possess paired ovaries typically containing 5–7 polytrophic ovarioles per ovary, with a maximum ovarian egg load of 97.3 ± 6.37 eggs per female, indicating a synovigenic reproductive strategy. Temperature, female age, and parasitoid-to-host ratios significantly influenced reproductive output. Adult longevity was highest at 20 °C. Ten-day-old females exhibited the highest parasitism rate (80.71% ± 8.16%), whereas five-day-old females produced the greatest number of offspring. Inoculation using 5–10-day-old females at 25 °C with a parasitoid-to-host ratio of 10:20 effectively improved mass-rearing efficiency.