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Journal of Zhejiang University (Agriculture and Life Sciences)  2023, Vol. 49 Issue (2): 159-166    DOI: 10.3785/j.issn.1008-9209.2022.07.113
Special Topic: Insect Physiology and Biochemistry & Pest Biological Control     
Evaluation of predatory function of Orius sauteri to the first-instar larvae of Mythimna separata (Walker)
Haolan YANG1(),Chengjun LI2(),Fu CAO1,Yulun SUN2,Maoye LI1,Su LIU1,Shiguang LI1()
1.Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, School of Plant Protection, Anhui Agricultural University, Hefei 230036, Anhui, China
2.Key Laboratory for Green Preservation and Control of Tobacco Diseases and Pests in Huanghuai Growing Area, Tobacco Research Institute, Henan Academy of Agricultural Sciences, Xuchang 461000, Henan, China
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Abstract  

In order to know the control potential of Orius sauteri to the first-instar larvae of oriental armyworm [Mythimna separata (Walker)], the predation ability of the fifth-instar nymphs, male adults and female adults of O. sauteri to the first-instar larvae of M. separata was determined in the laboratory, and the Holling Ⅱ and Hassell-Varley models were used for analyzing the functional response, searching efficiency and mutual interference of O. sauteri to the first-instar larvae of M. separata. The results showed that the female adults of O. sauteri had the strongest predation ability to the first-instar larvae of M. separata (the ratio of instantaneous attack rate to handling time on single prey was 19.692), and their theoretical maximum daily predation was 19.231 individuals, and their handling time on single prey was the shortest (0.052 d). The male adults of O. sauteri had the moderate predation ability to the first-instar larvae of M. separata (the ratio of instantaneous attack rate to handling time on single prey was 16.610), and their theoretical maximum daily predation was 16.949 individuals, and their handling time on single prey was 0.059 d. The fifth-instar nymphs of O. sauteri had the weakest predation ability to the first-instar larvae of M. separata (the ratio of instantaneous attack rate to handling time on single prey was 13.211), and their theoretical maximum daily predation was 13.103 individuals, and their handling time on single prey was the longest (0.076 d). The daily predation of O. sauteri was positively correlated with prey density and negatively correlated with searching efficiency. The predation rate of O. sauteri on the prey decreased with the increase of predator density, while the intra-species competition intensity enhanced with the increase of predator density. In conclusion, O. sauteri has the potential to control the first-instar larvae of M. separata, of which the female adults work best.



Key wordsOrius sauteri      Mythimna separata (Walker)      predatory effect      interference response      biological control     
Received: 11 July 2022      Published: 27 April 2023
CLC:  S476.2  
Corresponding Authors: Chengjun LI,Shiguang LI     E-mail: 949900286@qq.com;56397944@qq.com;lsg920@ahau.edu.cn
Cite this article:

Haolan YANG,Chengjun LI,Fu CAO,Yulun SUN,Maoye LI,Su LIU,Shiguang LI. Evaluation of predatory function of Orius sauteri to the first-instar larvae of Mythimna separata (Walker). Journal of Zhejiang University (Agriculture and Life Sciences), 2023, 49(2): 159-166.

URL:

https://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2022.07.113     OR     https://www.zjujournals.com/agr/Y2023/V49/I2/159


东亚小花蝽对东方黏虫1龄幼虫的捕食功能评价

为明确东亚小花蝽(Orius sauteri)对东方黏虫[Mythimna separata (Walker)]1龄幼虫的控制潜能,在室内条件下测定东亚小花蝽5龄若虫、雄成虫和雌成虫对东方黏虫1龄幼虫的捕食能力,并采用HollingⅡ模型和Hassell-Varley模型分别拟合计算东亚小花蝽对东方黏虫1龄幼虫的功能反应、搜寻效应和干扰反应。结果表明:东亚小花蝽雌成虫对东方黏虫1龄幼虫的捕食能力最强,其瞬时攻击率与处理单头猎物时间的比值为19.692,理论日最大捕食量为19.231头,且处理单头猎物时间最短,为0.052 d;东亚小花蝽雄成虫对东方黏虫1龄幼虫的捕食能力中等,其瞬时攻击率与处理单头猎物时间的比值为16.610,理论日最大捕食量为16.949头,处理单头猎物时间为0.059 d;东亚小花蝽5龄若虫对东方黏虫1龄幼虫的捕食能力最弱,其瞬时攻击率与处理单头猎物时间的比值为13.211,理论日最大捕食量为13.103头,处理单头猎物时间也最长,为0.076 d。东亚小花蝽的日捕食量与猎物密度呈正相关,与搜寻效应呈负相关;其对猎物的捕食作用率随自身密度的增加而降低,分摊竞争强度随自身密度的增加而增强。综上所述,东亚小花蝽对东方黏虫1龄幼虫具有较好的控制潜能,其中雌成虫的控制潜能最强。


关键词: 东亚小花蝽,  东方黏虫,  捕食作用,  干扰反应,  生物防治 
Fig. 1 Predation of the fifth-instar nymphs, male adults and female adults of O. sauteri to the first-instar larvae of M. separata

天敌虫态

Predator stage

捕食功能反应方程

Predatory functionalresponse equation

决定系数

Coefficient of

determination (R2)

瞬时攻击率

Instantaneous

attack rate (a)

处理时间

Handling

time (Th)/d

理论日最大捕食量/头

Theoretical maximum

daily predation/individual

捕食能力

Predation

ability (a/Th)

5龄若虫

Fifth-instar nymph

Na=1.004N/(1+0.076N)0.9831.0040.07613.10313.211

雄成虫

Male adult

Na=0.980N/(1+0.058N)0.9550.9800.05916.94916.610

雌成虫

Female adult

Na=1.024N/(1+0.053N)0.9721.0240.05219.23119.692
Table 1 Predatory functional response equations and parameters of O. sauteri to the first-instar larvae of M. separata
Fig. 2 Searching efficiency of the fifth-instar nymphs, male adults and female adults of O. sauteri to the first-instar larvae of M. separata

天敌虫态

Predator stage

东方黏虫密度/(头/管)

Density of M. separata/

(individual/tube)

日捕食量/头 Daily predation/individual
东亚小花蝽密度/(头/管) Density of O. sauteri/(individual/tube)
12345

5龄若虫

Fifth-instar nymph

5010.80±0.48a8.80±0.16b7.87±0.16bc7.05±0.08cd6.12±0.08d

雄成虫

Male adult

5010.60±0.42a8.50±0.13b6.13±0.07c5.30±0.08cd4.96±0.06d

雌成虫

Female adult

5011.20±0.31a8.60±0.15b7.47±0.07c6.20±0.08d5.08±0.04e
Table 2 Daily predation of O. sauteri with different densities to the first-instar larvae of M. separata
Fig. 3 Predation rate of the fifth-instar nymphs, male adults and female adults of O. sauteri with different densities to the first-instar larvae of M. separata
Fig. 4 Shared competition intensity of the fifth-instar nymphs, male adults and female adults of O. sauteri with different densities for predation of the first-instar larvae of M. separata
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