配对条件对象虫金小蜂繁殖效率的影响

    The impact of mating condition on the reproductive efficiency of Anisopteromalus calandrae

    • 摘要: 象虫金小蜂(Anisopteromalus calandrae)是鞘翅目储粮害虫的优势寄生蜂,其快速扩繁是实际应用中的关键。雌雄蜂状态对其扩繁效率具有重要影响。为深入探讨雌雄蜂状态对象虫金小蜂繁殖效率的影响,研究了雌蜂日龄、雌雄比例及配对时间对寄生蜂繁殖效率的作用。结果表明:3日龄雌蜂的子代出蜂量((10.50±1.78)头)、控害率((93.99±1.72)%)及子代雌蜂数((7.60±3.06)头)均达到峰值,而16日龄后雌蜂的繁殖能力显著下降;雌雄比例为3:1的处理组中,雌蜂寿命最长,为(17.40±0.55)d,控害率最高,为(82.10±5.14)%,但其子代雌性比(0.54±0.02)低于雌雄比例1:1处理组(0.75±0.07);配对时间为3 d时,雌蜂产卵天数与子代出蜂数(20.00±2.24)d最多,并维持较高的控害率(52.60±4.51)%,而配对时间较长(10 d)会导致繁殖能力下降。因此,象虫金小蜂雌蜂的最佳繁殖条件为选择3日龄雌蜂、雌雄比例3:1及短期配对(1~3 d)。本研究为优化天敌昆虫规模化繁育技术提供了关键参数,对提升储粮害虫生物防治效能具有重要指导作用。

       

      Abstract: The maize weevil parasitoid, Anisopteromalus calandrae, is a dominant parasitic wasp targeting stored-product Coleoptera pests, and rapid mass-rearing is a key factor influencing its practical application. The physiological state of female and male wasps significantly impacts their rapid reproduction. To gain deeper insights into the effects of female and male wasps' conditions on the reproductive efficiency of A. calandrae, this study investigated the influence of female age, sex ratio, and mating duration on parasitoid reproductive performance. The results showed that 3-day-old females achieved peak values in offspring emergence wasps (10.50±1.78), pest control rate (93.99±1.72) %, and number of female offspring wasps (7.60±3.06), while females aged over 16 days exhibited significantly reduced reproductive capacity. The 3:1 (female:male) sex ratio group had the longest female lifespan (17.40±0.55) d and the highest pest control rate (82.10±5.14)%, but its offspring sex ratio (0.54±0.02) was lower than that of the 1:1 group (0.75±0.07). Females with a 3-day mating duration showed the longest oviposition period and highest offspring emergence wasps (20.00±2.24) while maintaining a relatively high pest control rate (52.60±4.51)%. In contrast, prolonged mating duration (10 d) led to reduced reproductive performance. Therefore, the optimal reproductive conditions for A. calandrae females include selecting 3-day-old females, maintaining a 3:1 (female:male) sex ratio, and short-term mating (1-3 d). These findings provide key parameters for optimizing mass-rearing techniques of natural enemies and offer important guidance for enhancing the efficacy of biological control against stored-product pests.

       

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