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Chinese Journal of Biological Control ›› 2022, Vol. 38 ›› Issue (6): 1516-1525.DOI: 10.16409/j.cnki.2095-039x.2022.06.011

• RESEARCH REPORTS • Previous Articles    

Control Effect of Biogas Slurry on Rice Blast and Screening, Identification of Endophytic Antagonistic Bacteria

CHU Jin1, YAN Han1, HAN Tao2, XU Han1, YANG Hao1, MIAO Jiankun1, BAI Yuanjun3, DONG Hai1, LI Zhiqiang1   

  1. 1. Institute of Plant Protection, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China;
    2. Donggang Demonstration Breeding Farm, Dandong 118306, China;
    3. Liaoning Rice Research Institute, Shenyang 110101, China
  • Received:2022-04-11 Published:2022-12-16

Abstract: To determine the application value of biogas slurry in the control of rice blast, the antagonist activity of biogas slurry to five plant pathogens was measured by mycelial growth inhibition method. The results showed that biogas slurry had different degrees of inhibition ability on Magnaporthe oryzae, Ustilaginoidea oryzae, Rhizoctonia solani, Fusarium oxysporum and Phytophthora capsica, and the inhibition rates were 90.34%, 83.55%, 73.88%, 10.23% and 16.40%, respectively. The inhibition effect of biogas slurry was significantly better than that of biogas slurry sterile solution. In the pot experiment, biogas slurry stock solution and 50% dilution solution had better control effects on rice blast, and the efficacies reached 72.67% and 64.60%, respectively. Field experiment showed that the control efficacies of biogas slurry against leaf blast and neck blast were 58.99% and 66.57%, respectively, with no significant difference with that of the control agent 100 billion cfu/g Bacillus subtilis WP. Through the isolation, screening and identification of endophytic bacteria in biogas slurry, it was determined that biogas slurry contained antagonistic bacteria such as B. amyloliquefaciens, B. subtilis, B. methylotrophicus and B. licheniformis. The results indicated that biogas slurry has a good application prospect as a biological control resource for the control of rice blast.

Key words: biogas slurry, rice blast, biological control, antagonistic bacteria, Bacillus

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