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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (3): 424-430.DOI: 10.16409/j.cnki.2095-039x.2021.03.036

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Factors Influencing on the Control of Parasaissetia nigra Nietner by the Combination of Coccophagus japonicus Compere and Scutellista caerulea Fonscolombe

LI Xian1,2, FU Yueguan2, CHEN Junyu2, WANG Jianyun2, ZHU Junhong1, ZHANG Fangping2   

  1. 1. College of Plant Protection, Hainan University, Haikou 570228, China;
    2. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
  • Received:2020-09-20 Published:2021-06-16

Abstract: Coccophagus japonicus Compere and Scutellista caerulea Fonscolombe is the endoparasitic and ectoparasitic natural enemy of Parasaissetia nigra Nietner, respectively. To clarify the effects of host ages, parasitic wasp ratios, and temperature on the control effectiveness of the two wasps parasitizing P. nigra, an orthogonal experiment with 3 factors and 5 levels was conducted. The results showed that all the three factors (host ages, parasitic wasp ratios, and temperature) affected the combined control effectiveness of these two wasps. Among all the three factors, parasitic wasp ratio has the most significant effect on their control effectiveness followed by the temperature and host ages, respectively. The optimal treatment was 1 nymph:1 adult, only releasing C. japonicus at 27℃. The study aims at providing a solid foundation for the combined release of these two wasps in the fields to control P. nigra.

Key words: Coccophagus japonicus, Scutellista caerulea, Parasaissetia nigra

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