《环境昆虫学报》

台湾甲腹茧蜂Chelonus formosanus是鳞翅目多科害虫的一种重要卵-幼虫跨期寄生蜂。本团队以斜纹夜蛾Spodoptera litura卵为对象研究了台湾甲腹茧蜂的寄生行为，并测试了其对斜纹夜蛾和草地贪夜蛾Spodoptera frugiperda卵的寄生功能反应。研究结果表明，台湾甲腹茧蜂的寄生行为包括搜寻、检测、清理、刺探、产卵和产卵后清洁六个步骤，平均每块寄主卵的寄生时间约为186.1 min。台湾甲腹茧蜂对斜纹夜蛾和草地贪夜蛾卵的寄主数量达到250粒时，其寄生量开始趋于稳定，均符合Holling Ⅱ功能反应类型。功能反应参数表明，试验条件下台湾甲腹茧蜂对斜纹夜蛾和草地贪夜蛾卵都具有较高的瞬间攻击率（α = 1.1846和α = 1.1855）和寄生上限（Na(max) = 538.45和Na(max) = 564.52）及较短的处理时间（Th = 0.0019 d和Th = 0.0018 d）。研究结果表明，台湾甲腹茧蜂对斜纹夜蛾和草地贪夜蛾具有较高的生物防治潜能，为今后规模化繁育该蜂用于防治这两种重要害虫提供了理论参考。

英文摘要:

Chelonus formosanus Sonan (Braconidae) serves as a natural enemy of lepidopteran pests in agricultural ecosystems. This study investigated the parasitic behavior of C. formosanus on Spodoptera litura eggs under laboratory conditions (26±1°C, 75±5% RH, 14L:10D) and evaluated its response to varying densities of S. litura and Spodoptera frugiperda eggs. The observed parasitic behavior of C. formosanus comprised six distinct steps: searched, detected, cleaned, probed, oviposited, and post-oviposition cleaned. The mean duration was 186.1 min per egg mass. C. formosanus exhibited a Holling type II functional response model to the eggs of both pest species, with parasitism rates reaching a plateau at densities of up to 250 eggs. The functional response parameters indicated a high instantaneous attack rate (α = 1.1846 vs. 1.1855 for S. litura and S. frugiperda, respectively), high parasitism efficiency (Na(max): 538.45 and 564.52, respectively), and short handling time (Th: 0.0019 and 0.0018, respectively). These findings demonstrate the remarkable biocontrol potential of C. formosanus against both noctuid pests, providing critical theoretical foundations for mass rearing programs and integrated pest management strategies.

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