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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (11): 108-112.doi: 10.11924/j.issn.1000-6850.casb2022-0409

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Screening and Synergistic Evaluation of Fungicides Against Rhizoctonia cerealis on Wheat and Fusarium graminearum on Maize

JI Xianglong1(), WANG Kaiyun2, WU Yuguo2, JIANG Lili3()   

  1. 1 Shandong Agricultural Ecology and Resource Protection Station, Ji’nan 250013
    2 College of Plant Protection, Shandong Agricultural University, Tai’an, Shandong 271018
    3 Shandong Institute of Pomology, Tai’an, Shandong 271000
  • Received:2022-05-19 Revised:2022-07-30 Online:2023-04-15 Published:2023-04-10

Abstract:

The indoor toxicity of different fungicides against Rhizoctonia cerealis on wheat and Fusarium graminearum on maize were measured by growth rate method. For fungicides with high efficiency, Sun Johnson’s method was used to evaluate the synergistic effect of each ratio. The results showed that, hexaconazol and fludioxonil had the highest indoor toxicity to R. cerealis, with EC50 value of 0.094 mg/L and 0.312 mg/L, respectively. The indoor toxicity of prochloraz and hexaconazol to F. graminearum was the highest; with EC50 value of 0.088 mg/L and 0.593 mg/L, respectively. The combination of hexaconazol and fludioxonil in different ratios exhibited no obvious synergistic effect on R. cerealis. The combination of prochloraz and hexaconazol at the ratio of 1:5, 1:2 and 1:1 showed obvious synergistic effect. Among which the 1:5 ratio had the co-toxicity coefficient of 212.2, and its synergistic effect was most significant, which could be considered for the prevention and control of the above diseases in production.

Key words: Rhizoctonia cerealis on wheat, Fusarium graminearum on maize, hexaconazole, prochloraz, indoor toxicity, mycelial growth