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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2015年52 No.1

Predation of Axinoscymnus apioides Kuznetsov & Ren on Bemisia tabaci (Gennadius)
Author of the article:ZHOU Hui-Ping1, 2** WANG Xing-Min1 Qiu Bao-Li1 WU Jian-Hui1 REN Shun-Xiang1***
Author's Workplace:1. Engineering Research Center of Biological Control, Ministry of Education, South China Agricultural University, Guangzhou 510642, China; 2. Hunan Entry-Exit Inspection and Quarantine Bureau, Changsha 410004, China
Key Words: Axinoscymnus apioides, Bemisia tabaci, predation functional response
Abstract:[Objectives]  The sweetpotato whitefly, Bemisia tabaci (Gennadius) is an important invasive insect pest of agricultural crops and Axinoscymnus apioides Kuznetsov & Ren is one of its important predators. The present paper presents the results of a systematic investigation of the predation of A. apioides on B. tabaci. [Methods]  Under laboratory conditions of T=(29±2), RH=80±5% and LD=1410, the functional response of adult A. apioides to B. tabaci of different developmental stages, and to B. tabaci 4th instar larvae at different temperatures, and the degree of mutual interference between individual ladybirds preying on B. tabaci 4th instar larvae, were studied. [Results]  The functional response of adult A. apioides on different developmental stages of B. tabaci conformed to the Hollings type II equation. The search rate (a) of A. apioides adults for the eggs, 1st, 2nd, 3rd, 4th instars, and pupae, of B. tabaci were 1.3883, 1.1027, 0.8293, 0.5392, 0.4981 and 0.3422, respectively and the handing time (Th) of these prey items were 0.0030, 0.0169, 0.0281, 0.0368, 0.0758 and 0.0593, respectively. As shown from the model parameters, search rate decreased with handling time from egg to pupa. The search rate of adult A. apioides was highest for B. tabaci eggs and lowest for 4th instar larvae. However, handling time was highest for 4th instar larvae and lowest for B. tabaci eggs. Data indicate that the eggs of B. tabaci were the preferred prey of A. apioides. The functional response of adult A. apioides on the eggs of B. tabaci was determined at six different temperatures (15, 20, 25, 30, 35). Predation efficiency (E) varied with environmental temperature. The influence of temperature on search rate (a) and handling time (Th) can be described by the equations a=-0.3622+0.0589T-0.0009T2 and Th=0.6628-0.0382T+0.0006T2. Mutual interference between individual predators could be described by Hassell and Varleys equation. The relationship between predation ratio (E) and natural enemy density (P) was E=0.5205P0.5569. The interference coefficient (m) was 0.5569 and the search coefficient (Q) was 0.0609. [Conclusion]  The search rate of adult A. apioides decreased and handling time increased with the developmental stage of prey (egg to pupa stage). Predation efficiency increased with environmental temperature to 30, but decreased when at environmental temperatures > 30. Search time was shorter when the environmental temperature was rising. Mutual interference between individual predators exists and predation efficiency decreased when the density of A. apioides increased.


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