黄带犀猎蝽对草地贪夜蛾幼虫的捕食功能反应研究
The predatory functional responses of Sycanus croceovittatus preying on Spodoptera frugiperda larvae
陈苏怡；赵 萍；史爱民；石萍丽；彩万志；石安宪；李 虎
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DOI：10.7679/j.issn.2095-1353.2022.053
作者单位：中国农业大学植物保护学院昆虫学系，北京 100193；南宁师范大学地理与海洋研究院，南宁 530001； 苏州推动者生物科技有限公司，苏州 215000；昭通市植保植检站，昭通 657100
中文关键词：草地贪夜蛾；黄带犀猎蝽；捕食功能反应；搜寻效应；干扰反应
英文关键词：Spodoptera frugiperda; Sycanus croceovittatus; predatory functional response; searching effect; interference effect
中文摘要：
【目的】 为探明黄带犀猎蝽Sycanus croceovittatus对草地贪夜蛾Spodoptera frugiperda的控害效果。【方法】 在室内条件下开展黄带犀猎蝽3-5龄若虫和成虫对草地贪夜蛾3龄和4龄幼虫的捕食功能反应、搜寻效应和自身密度对其捕食作用的干扰反应。【结果】 黄带犀猎蝽各龄期若虫和成虫对草地贪夜蛾幼虫的捕食功能反应均符合Holling Ⅱ模型；拟合Holling Ⅱ模型中黄带犀猎蝽3-5龄若虫、雌虫和雄成虫对草地贪夜蛾3龄幼虫的日均最大捕食量分别为23.267、18.252、25.432、59.559和51.894头，控害效能分别为10.321、19.219、21.251、52.877和44.390；对4龄幼虫的日均最大捕食量分别为5.886、7.570、8.584、22.477和10.057头，控害效能分别为4.861、7.023、7.906、26.410和14.402，其中雌成虫的控害效能最大。黄带犀猎蝽对草地贪夜蛾的捕食作用同时受猎物密度与捕食者自身密度的双重影响，捕食量与猎物密度呈正相关，搜寻效应与猎物密度呈负相关，干扰反应与捕食者密度呈正相关。【结论】 黄带犀猎蝽若虫和成虫对草地贪夜蛾3龄和4龄幼虫均有一定的捕食能力，且成虫的捕食能力优于若虫。
英文摘要：
[Objectives] To evaluate the
potential of the assassin bug, Sycanus croceovittatus, as a
biological control for Spodoptera frugiperda. [Methods] The predatory functional
responses of 3rd to
5th-instar nymphs and adults of Sy.
croceovittatus preying on 3rd and 4th instar Sp. frugiperda larvae were tested under laboratory conditions. The effect of
population density on the predatory behavior of Sy.
Croceovittatus was also
investigated. [Results]
The predatory functional responses of Sy. croceovittatus age
classes fitted the Holling Ⅱ disc equation. According to this model, 3rd to 5th instar nymphs, and female
and male adults, of Sy. croceovittatus consumed a daily maximum of 23.267,
18.252, 25.432, 59.559 and 51.894 3rd instar Sp. frugiperda larvae, respectively, and had a predation capacity
of 10.321, 19.219, 21.251, 52.877 and 44.390, respectively. Daily maximum
consumption of the above age classes was 5.886, 7.570, 8.584, 22.477 and 10.057,
respectively, and the predation capacity for 4th instar Sp. frugiperda larvae was 4.861, 7.023, 7.906, 26.410 and 14.402,
respectively. Adults females were the most efficient predators. Predation of Sy. croceovittatus on Sp. frugiperda was affected by
both prey and predator density. Predation rate was positively correlated with
prey density, search duration was negatively correlated with prey density, and
interference was positively correlated with predator density. [Conclusion] In general,
nymphs and adults of Sy. croceovittatus could partly control 3rd and 4th instar Sp. frugiperda larvae, but adults were more efficient
predators than nymphs.