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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (2): 201-208.DOI: 10.16409/j.cnki.2095-039x.2020.05.005

• RESEARCH REPORTS • Previous Articles    

Population Rejuvenation Technique for Aphidius gifuensis (Hymenoptera: Aphidiidae)

XIE Yingqiang1,2, ZHANG Hongzhi2, XIANG Mei1, ZHANG Limeng3, WANG Deling4, LI Yuyan1, AI Hongmu2, ZHANG Lisheng1   

  1. 1. Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100039, China;
    2. College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China;
    3. Yuxi City Company of Yunnan Tobacco Company, Yuxi 653100, China;
    4. Hongyan Town Agricultural Comprehensive Service Center, Dali 675601, China
  • Received:2019-01-16 Published:2021-04-14

Abstract: Aphidius gifuensis is an excellent natural enemy of Myzus persicae. In the past 20 years, the technology of mass rearing of A. gifuensis in China has been ripening gradually, and great achievements have been made in its application in control of crop aphids. However, it is found in practice that, after several generations of mass rearing, the parasitism, viability and body size and weight of A. gifuensis decrease at varying degrees, which reduces the vitality of the population of mass-reared A. gifuensis and has become the bottleneck of continuous mass rearing of A. gifuensis. In previous experiments, it was found that degeneration of A. gifuensis occurred in the 7th generation since initiation of continuous rearing. To explore measures to rejuvenate the wasp population, attempts were made to feed the population with nutrients like fresh water, sucrose, honey, and glucose or to crossbreed the population with wild wasps collected from Fujian, Yunnan, and Hebei. Parasitism, emergence rate, adult longevity, and body size of the rejuvenated wasp population were measured. Results showed that nutrients had a certain rejuvenating effect on longevity and parasitism, and 10% honey solution achieved the best performance. However, crossbreeding outperformed any nutrients, with remarkable effects on parasitism, emergence rate, adult longevity, and body size. Crossbreeding was more effective with wild females than with wild males, and with wild populations from Yunnan than with those from Fujian and Hebei. Crossbreeding for two generations with wild female populations from Yunnan improved parasitism rate to 88.21% of Generation F0 and the parasitism remained even with continuous mass rearing for two generations. The results show that crossbreeding for two generations with wild female populations of A. gifuensis collected from Yunnan can effectively rejuvenate the degenerated indoor populations in Hebei.

Key words: Aphidius gifuensis, artificial propagation, population rejuvenation, rejuvenation technique

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