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journal1 ›› 2018, Vol. 34 ›› Issue (2): 214-219.DOI: 10.16409/j.cnki.2095-039x.2018.02.006

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Functional Responses of Amblyseius orientalis and A. tsugawai to Eggs and 1st Instars of Bemisia tabaci

YANG Jingyi1, SHENG Fujing1, SONG Ziwei2, LÜ Jiale1, XU Xuenong1, LI Dunsong2, WANG Endong1   

  1. 1. Key Laboratory of Integrated Pest Management in Crops, Ministry of Agriculture/Institute of P1 ant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Guangdong Provincial Key Laboratory of High Technology for Plant Protection/Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
  • Received:2017-09-14 Online:2018-04-08 Published:2018-04-13

Abstract: Bemisia tabaci is an important agricultural pest that infests crops, vegetables, and ornamental plants. It often causes severe injury and is hard to be efficiently controlled using pesticides. Biological control is an effective alternative of chemical control, and some Phytoseiid species are commercialized as biological control agents for B. tabaci. However, these species are aliens to China and may cause environmental risks if introduced inadequately. It is necessary to search native natural enemies of B. tabaci. Preliminary experiments showed that Amblyseius orientalis and A. tsugawai both preyed on eggs and 1st instar immatures of B. tabaci. Functional response analyses were conducted to estimate their biological control potential. Both species showed Holling Ⅱ type functional response to B. tabaci. The theoretical maximum daily consumption rate of A. tsugawai adult females to B. tabaci eggs and 1st instars were 19.6 and 10.7 per day, respectively, ca. 53.5% and 2.6% higher than those of A. orientalis. The theoretical maximum daily consumption rate of A. tsugawai to B. tabaci eggs was 3.6 per day, but males hardly preyed on 1st instars. In contrast, this rate of A. orientalis to B. tabaci eggs and 1st instars were 3.3 and 4.3 per day, respectively. Over all, A. tsugawai showed higher potential in preying B. tabaci than A. orientalis, and is the most potential native Phytoseiid species that might be used in B. tabaci control.

Key words: Amblyseius orientalis, Amblyseius tsugawai, Bemisia tabaci, functional response

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