| 黄带犀猎蝽对斜纹夜蛾3、4龄幼虫的捕食功能反应 |
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| 引用本文：陈苏怡,杨毅娟,王孟卿,李永青,石安宪,杨海林,李虎,彩万志.黄带犀猎蝽对斜纹夜蛾3、4龄幼虫的捕食功能反应.植物保护学报,2023,50(2):519-529 |
| DOI：10.13802/j.cnki.zwbhxb.2023.2021129 |
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| 中文摘要:为明确黄带犀猎蝽Sycanus croceovittatus对斜纹夜蛾Spodoptera litura的控害潜能,在实验室条件下对黄带犀猎蝽3~5龄若虫和雌雄成虫对斜纹夜蛾3、4龄幼虫的捕食功能反应、搜寻效应和自身密度干扰反应进行研究。结果表明,黄带犀猎蝽对斜纹夜蛾幼虫的捕食功能反应均符合Hol-ling II型和Holling III型2种模型;在拟合Holling II模型中,黄带犀猎蝽3~5龄若虫和雌雄成虫对斜纹夜蛾3龄幼虫的日均最大捕食量分别为2.78、4.17、4.35、12.50和8.33头,控害效能分别为5.53、6.54、8.78、14.75和10.42;对斜纹夜蛾4龄幼虫的日均最大捕食量分别为2.56、2.86、3.85、3.57和4.35头,控害效能分别为2.23、3.94、4.54、11.32和5.70,其中雌成虫的控害效能最大。在拟合Hol-ling III模型中,对斜纹夜蛾3龄幼虫的日均最大捕食量分别为2.75、4.10、4.32、10.76和7.41头,最佳寻找密度分别为1.19、2.03、1.73、5.28和3.88头/盒;对斜纹夜蛾4龄幼虫的日均最大捕食量分别为2.38、2.78、3.55、3.58和4.00头,最佳寻找密度分别为1.83、1.50、2.06、0.95和2.10头/盒。搜寻效应与害虫密度呈负相关;种内干扰效应与天敌密度呈正相关。表明黄带犀猎蝽成虫对斜纹夜蛾3、4龄幼虫的捕食能力优于黄带犀猎蝽若虫。 |
| 中文关键词:黄带犀猎蝽 斜纹夜蛾 捕食功能反应 生物防治 |
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| Predatory functional responses of assassin bug Sycanus croceovittatus to the 3rd- and 4th-instar larvae of taro caterpillar Spodoptera litura |
| Author Name | Affiliation | E-mail | | Chen Suyi | Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China | | | Yang Yijuan | Station of Plant Protection of Zhaotong City, Zhaotong 657100, Yunnan Province, China | | | Wang Mengqing | Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China | | | Li Yongqing | Station of Plant Protection of Zhaotong City, Zhaotong 657100, Yunnan Province, China | | | Shi Anxian | Station of Plant Protection of Zhaotong City, Zhaotong 657100, Yunnan Province, China | | | Yang Hailin | Yunnan Tobacco Company, Yuxi Branch, Yuxi 653100, Yunnan Province, China | | | Li Hu | Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China | | | Cai Wanzhi | Department of Entomology, College of Plant Protection, China Agricultural University, Beijing 100193, China | caiwz@cau.edu.cn |
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| Abstract:To clarify the predation ability of the assassin bug Sycanus croceovittatus against Spodoptera litura, the 3rd- to 5th-instar nymphs, and female and male adults of Sy. croceovittatus were tested for their predatory functional responses to and searching effects on the 3rd- and 4th-instar larvae of Sp. litura as well as the effect of conspecific density on their predation success under laboratory conditions. The results showed that the functional responses of Sy. croceovittatus at all developmental stages fitted the Holling II and Holling III disc equations. In the Holling II model, the 3rd- to 5th-instar nymphs, and female and male adults of Sy. croceovittatus had a daily maximum consumption of 2.78, 4.17, 4.35, 12.50 and 8.33, and a predatory capacity of 5.53, 6.54, 8.78, 14.75 and 10.42, respectively, against Sp. litura 3rd-instar larvae; a daily maximum consumption of 2.56, 2.86, 3.85, 3.57 and 4.35, and a predatory capacity of 2.23, 3.94, 4.54, 11.32 and 5.70 were observed against Sp. litura 4th-instar larvae, respectively, with the female adult showing the best pest control efficiency. According to the Holling III model, the 3rd- to 5th-instar nymphs, and female and male adults of Sy. croceovittatus had a daily maximum consumption of 2.75, 4.10, 4.32, 10.76 and 7.41, and an optimal searching density of 1.19, 2.03, 1.73, 5.28 and 3.88 per box, respectively, against Sp. litura 3rd-instar larvae; there was a daily maximum consumption of 2.38, 2.78, 3.55, 3.58 and 4.00, and an optimal searching density of 1.83, 1.50, 2.06, 0.95 and 2.10 per box, respectively, against Sp. litura 4th-instar larvae. The searching effect was negatively correlated with the pest density. The intraspecific interference effect was positively correlated with the density of predator. The results indicated that the predation ability of Sy. croceovittatus adults was stronger than nymphs. |
| keywords:Sycanus croceovittatus Spodoptera litura predatory functional responses biological control |
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