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Chinese Journal of Biological Control ›› 2024, Vol. 40 ›› Issue (3): 524-531.DOI: 10.16409/j.cnki.2095-039x.2023.01.055

• RESEARCH REPORTS • Previous Articles    

Effect of Bacillus thuringiensis G033A on the Ability of Three Trichogramma Species to Parasitize Tuta absoluta

JIANG Zhengxiong1, CHEN Heng1, SUN Ying1, ZHOU Shunwen1, ZHANG Jinlong1, CHEN Guohua1, ZHU Qingqing1, ZHANG Xiaoming1,2   

  1. 1. School of Plant Protection, Yunnan Agricultural University/State Key Laboratory of Yunnan Biological Resources Protection and Utilization, Kunming 650201, China;
    2. Wageningen University and Research Greenhouse Horticulture, Bleiswijk 2265ZG, the Netherlands
  • Received:2023-04-26 Published:2024-06-07
  • Contact: 国家重点研发计划(2021YFD1400200);云南省中青年学术技术带头人后备人才项目(202105AC160071);“云南省高层次人才培养支持计划”青年拔尖人才专项(YNWRQNBJ2020291);国家留学基金项目(留金项-2021-15 号)
  • Supported by:
    10.16409/j.cnki.2095-039x.2023.01.055

Abstract: Toxicity of Bacillus thuringiensis G033A (Bt G033A) to different instar larvae of Tuta absoluta and effect of Bt G033A on the ability of three Trichogramma species to parasitize T. absoluta were determined by leaf dipping method and feed mixed toxicity method, respectively. The results showed that the LC50 of Bt G033A to the 1st, 2nd, 3rd, and 4th instar T. absoluta larvae were 25.381, 19.537, 17.406, and 15.772 g/L, respectively, while Bt G033A was low toxic to the three Trichogrammaspecies. Although the parasitic functional responses of T. ostriniae, T. chilonis and T. dendrolimi to T. absoluta eggs conformed to the Holling II model, the parasitic ability of the three Trichogramma species decreased post treatment with the recommended concentration of Bt G033A in the field. Among them, the parasitism amount (25 eggs/dish: 18.600 eggs), prey treatment time (0.012 d), pest control efficiency (84.833), daily parasitism upper limit (83.333 eggs), and prey search efficiency of T. ostriniae in the control group showed that T. ostriniae was superior to T. chilonis and T. dendrolimi. Likewise, T. ostriniae showed higher post-treatment parasitic performance than t the other two Trichogramma species. Therefore, T. ostriniae can be used as one of the high-potential parasitic natural enemies of T. absoluta and can applied in combination with Bt G033A in biocontrol of T. absoluta.

Key words: Bacillus thuringiensis G033A, Tuta absoluta, Trichogramma, parasitize function, foraging effect

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