Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (22): 4837-4841.doi: 10.3864/j.issn.0578-1752.2013.22.022

• RESEARCH NOTES • Previous Articles     Next Articles

Interspecific Competition Between Encarsia sophia and E. formosa and Their Impacts on Suppression of Trialeurodes vaporariorum

 LIU  Lin-Zhou-1, DAI  Peng-1, LU Bing-1 , ZANG  Lian-Sheng-1, DU  Wen-Mei-1, WAN  Fang-Hao-2   

  1. 1.Engineering Research Center of Natural Enemy Insects, Institute of Biological Control, Jilin Agricultural University, Changchun 130118
    2.State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193
  • Received:2013-04-10 Online:2013-11-15 Published:2013-06-18

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Abstract: 【Objective】The objective of this study is to determine the potential of Encarsia sophia, a heteronomous hyperparasitoid, replacing primary parasitoids that share the same hosts and disrupting whitefly suppression in combination with primary parasitoids E. formosa. 【Method】 In this study, E. sophia and the primary parasitoid, E. formosa were released at ratios of 10﹕0, 8﹕2 , 5﹕5, 2﹕8 and 0﹕10 for controlling the greenhouse whitefly, Trialeurodes vaporariorum, on tomato. After releasing, the population dynamics of E. sophia, E. formosa and T. vaporariorum were investigated every 20 d.【Result】The percentage of E. formosa in total parasitoids was always kept about 50% sixty days after both parasitoids were released at different ratios. Releases of any one parasitoid species only or both of the parasitoids at different ratios provided low levels of whitefly population. Especially, the population of T. vaporariorum was always effectively suppressed with more than 83% whiteflies killed by parasitism and host feeding after E. sophia and E. formosa were released at a ratio of 5﹕5.【Conclusion】The heteronomous hyperparasitoid (E. sophia) can’t replace the primary parasitoid (E. formosa) on T. vaporariorum. The competitive interactions between the two parasitoid species do not reduce the efficiency of whitefly suppression.

Key words: Encarsia sophia , Encarsia formosa , Trialeurodes vaporariorum , competitive displacement , biological control

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