The 5th Instar Nymph of Picromerus lewisi: Predation Responses to Different Instars of Mythimna seperata

doi:10.11924/j.issn.1000-6850.casb2021-0251

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (3): 116-120.doi: 10.11924/j.issn.1000-6850.casb2021-0251

Special Issue: 生物技术

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The 5th Instar Nymph of Picromerus lewisi: Predation Responses to Different Instars of Mythimna seperata

SHEN Xiuxian¹(), TIAN Tai’an¹, LIU Jianfeng¹, YU Xiaofei², DONG Xiangli³, LI Zhimo³, YANG Maofa¹^,²()

¹Institute of Entomology of Guizhou University, Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Regions, Guiyang 550025
²College of Tobacco Science of Guizhou University, Guiyang 550025
³Fenggang Branch of Guizhou Tobacco Company, Zunyi, Guizhou 564200

Received:2021-03-20 Revised:2021-06-13 Online:2022-01-25 Published:2022-02-25
Contact: YANG Maofa E-mail:xiuxianshen_2017@126.com;gdgdly@126.com

Abstract

Abstract:

The aim is to study the biological control potential of Picromerus lewisi for Mythimna separata. The predation ability of the 5th instar nymphs of Picromerus lewisi on the 3rd to the 6th instar larvae of Mythimna separata was detected under the indoor condition. The results showed that the predation of the 5th instar nymphs of Picromerus lewisi on the 3rd to the 6th instar larvae of Mythimna separata accorded with Holling Ⅱ equation. The average maximum daily prey was the 3rd instar larva (24.390) > the 4th instar larva (7.042) > the 5th instar larva (6.061) > the 6th instar larva (3.690). The instantaneous attack rate was the 3rd instar larva (1.303)> the 4th instar larva (0.404)> the 5th instar larva (0.581)> the 6th instar larva (0.554). With the increase of the density of Mythimna separata at different instars, the searching efficiency of Picromerus lewisi 5th instar nymphs gradually decreased, and the searching efficiency for the 3rd instar larvae was the highest, and a/Th was 31.780. With the increase of the density of the 5th instar nymphs of Picromerus lewisi, the interference effect increased, and the intraspecific interference coefficient was 0.720. This study show that the 5th instar nymphs of Picromerus lewisi could prey on the 3rd to the 6th instar larvae of Mythimna separata, among which the predatory potential for the 3rd instar Mythimna separata is the largest.

Key words: Picromerus lewisi, Mythimna seperata, predation, searching efficiency, intraspecific interference, biological control

CLC Number:

S435.13

SHEN Xiuxian, TIAN Tai’an, LIU Jianfeng, YU Xiaofei, DONG Xiangli, LI Zhimo, YANG Maofa. The 5th Instar Nymph of Picromerus lewisi: Predation Responses to Different Instars of Mythimna seperata[J]. Chinese Agricultural Science Bulletin, 2022, 38(3): 116-120.

Figures/Tables 5

References 22

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龄期	捕食功能方程	R²	瞬时攻击率(a)	处理时间(Th)/d	日最大捕食量(1/Th)/头	控害效能(a/Th)
3龄幼虫	Na=1.303N/（1+0.053N）	0.949	1.303	0.041	24.390	31.780
4龄幼虫	Na=0.404N/（1+0.057N）	0.990	0.404	0.142	7.042	2.845
5龄幼虫	Na=0.581N/（1+0.096N）	0.976	0.581	0.165	6.061	3.521
6龄幼虫	Na=0.554N/（1+0.150N）	0.975	0.554	0.271	3.690	2.044

龄期	捕食功能方程	R²	瞬时攻击率(a)	处理时间(Th)/d	日最大捕食量(1/Th)/头	控害效能(a/Th)
3龄幼虫	Na=1.303N/（1+0.053N）	0.949	1.303	0.041	24.390	31.780
4龄幼虫	Na=0.404N/（1+0.057N）	0.990	0.404	0.142	7.042	2.845
5龄幼虫	Na=0.581N/（1+0.096N）	0.976	0.581	0.165	6.061	3.521
6龄幼虫	Na=0.554N/（1+0.150N）	0.975	0.554	0.271	3.690	2.044

天敌密度	单头天敌捕食量/头	均捕食作用率	分摊竞争强度
1	15.14a	0.2524	0
2	9.93b	0.1655	0.3443
3	8.09bc	0.1349	0.4654
4	5.96cd	0.0994	0.6061
5	5.00d	0.0833	0.6698
6	3.98d	0.0663	0.7374

天敌密度	单头天敌捕食量/头	均捕食作用率	分摊竞争强度
1	15.14a	0.2524	0
2	9.93b	0.1655	0.3443
3	8.09bc	0.1349	0.4654
4	5.96cd	0.0994	0.6061
5	5.00d	0.0833	0.6698
6	3.98d	0.0663	0.7374

The 5th Instar Nymph of Picromerus lewisi: Predation Responses to Different Instars of Mythimna seperata

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