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Chinese Journal Of Biological Control ›› 2020, Vol. 36 ›› Issue (2): 163-168.DOI: 10.16409/j.cnki.2095-039x.2020.02.002

• RESEARCH REPORTS • Previous Articles     Next Articles

Population Degradation Rule of Aphidius gifuensis (Hymenoptera:Aphidiidae)

XIE Yingqiang1, ZHANG Hongzhi2, LI Yuyan2, KONG Lin2, XIANG Mei2, YANG Hongli1, ZHANG Limeng3, AI Hongmu1, ZHANG Lisheng2   

  1. 1. College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    2. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100039, China;
    3. Yuxi City Company of Yunnan Tobacco Company, Yuxi 653100, China
  • Received:2019-06-29 Online:2020-04-08 Published:2020-04-16

Abstract: Aphidius gifuensis Ashmead is a dominant natural enemy insect for controlling Myzus persicae. Over the past 20 decades, the technology of propagation of A. gifuensis has become increasingly mature, and it has been widely used in the crop control of M. persicae. However, it has been found that the parasitism, viability and body size of A. gifuensis decrease in varying degrees after successive generations. It will not only reduce the viability of the whole population of A. gifuensis, but also becomes the bottleneck of continuous and large-scale propagation. In order to explore the relationship between population decline degree and breeding algebra of A. gifuensis, we analyze and conclude the characteristics of population degradation. Under the conditions of indoor continuous breeding, measurement was further carried out focusing on the reproductive amount, eclosion rate, sex ratio, adult longevity, adult metathoracic tibia lengths and other characteristics of gynogenetic mummified A. gifuensis of different generation. The results showed that from F1 to F12generations of A. gifuensis, the number of gynogenetic mummified aphids decreased by 67.22%, the emergence rate decreased by 31.91%, the female ratio increased by 33.32%, the life span of adult bees decreased by 53.85%, the length of tibial spur in hind foot of female and male bees decreased by 17.67% and 28.74%, respectively, and the characteristics of F7-F9 generations declined significantly. The present experiment supports that the population of A. gifuensis declines generally in F7 generation when it is propagated indoors, production needs to take timely measures to rejuvenation.

Key words: Aphidius gifuensis, artificial propagation, population degradation, degradation rule

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