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Chinese Journal of Biological Control ›› 2023, Vol. 39 ›› Issue (5): 1244-1252.DOI: 10.16409/j.cnki.2095-039x.2023.02.046

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Synergistic Effect of Trichoderma and Fungicides on Atractylodes chinensis Southern Blight Caused by Sclerotium rolfsii

HE Zidian1, HAN Yamei1, JIN Ge1, GAO Yufeng2, MIN Kang1   

  1. 1. Hebei Key Laboratory of Crop Stress Biology/College of Agronomy and Biotechnology, Hebei Normal University of Science & amp;Technology, Qinhuangdao 066000, China;
    2. Editorial Department of Journal, Qinhuangdao 066000, China
  • Received:2022-11-14 Online:2023-10-08 Published:2023-10-25

Abstract: In order to control effectively southern blight caused by Sclerotium rolfsii of Atractylodes chinensis as well as reducing the dosage of chemical fungicides, Trichoderma strains that can be used in combination with fungicides were screened out. Toxicity of 12 chemical fungicides agents and 7 Trichoderma stains against S. rolfsii was firstly tested in vitro with toxic medium method. And Trichoderma asperellum T16, Trichoderma atroviride T15 and Trichoderma harzianum T11 were subsequently shown to exhibit bio-compatibility with fungicides proved by dural culture and synergistic effect method. Control efficacy of the combination on suppressing of southern blight of A.chinensis was further tested in field experiment. The results showed that the VEC50between240 g/L thifluzamide SC, 30% hymexazol AS and 80% mancozeb WP with T. asperellum T16, T. atroviride T15 and T. harzianum T11 were higher than 1, respectively, which indicated good bio-compatibility. In the reducing half dosage of thifluzamide condition, the synergistic control effect of thifluzamide combined with T. asperellum T16 and T. atroviride T15 on southern blight reached 80.76% and 78.82%, respectively, which increased by 13.36% and 10.64% compared with thifluzamide control. In conclusion, T. asperellum T16 and T. atroviride T15could synergize with thifluzamide to control A. chinensis southern blight, which was much more effective than applying 100% fungicides.

Key words: Atractylodes chinensis southern blight disease, Trichoderma asperellum, Trichoderma atroviride, thifluzamide, synergistic effect

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