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Chinese Journal of Biological Control ›› 2022, Vol. 38 ›› Issue (2): 393-403.DOI: 10.16409/j.cnki.2095-039x.2022.02.009

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Study of Bacillus amyloliquefaciens Lx-11 Suspension Formulations and Evaluation Its Control Effect on Bacterial Blight of Rice

ZHANG Hao1,2, ZHANG Rongsheng2, QI Zhongqiang2, YU Junjie2, QIAO Junqing2, LIU Youzhou2, LIU Yongfeng1,2   

  1. 1. College of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, China; 2. Institute of Plant Protection of Jiangsu Academy of Agricultural Sciences, Nanjing 210014,China
  • Received:2021-11-11 Online:2022-04-08 Published:2022-04-20

Abstract: The registered formulations of Billus spp. fungicide are mainly suspension concentrate and water power. however, the formulations of Billus spp. fungicide are relatively simple. In orde to further improve the shelf life and control efficiency of Bacillus amyloliquefaciens Lx-11 fungicide, nanomaterials and functional additives were screened, while under the action of a high-speed homogenizer shearing to development Bacillus amyloliquefaciens Lx-11 suspoemulsion. The results indicated that Bacillus amyloliquefaciens Lx-11 suspoemulsion formulation including the fermented liquid 70%—80%, fume silica 10%—15%, soybean oil 30%—50%, emulsifier Span80 and Tween 80 compound 6%—10%, dispersant AEC-9Na 1%—3%, antifreeze ethylene glycol 2%—4%, synergist SY-6535 1.5%—2.5%. The character of suspoemulsion exhibited Bacillus amyloliquefaciens Lx-11 content was more than 8×108cfu/mL, the suspension ratio was more than 85%, the viscosity was 225 mPa·s, while thermal storage stability meet the standards of suspoemulsion. Field trials showed that Bacillus amyloliquefaciens Lx-11suspoemulsion control effect is a significantly higher than that of fermented liquidon against rice bacterial blight.

Key words: Bacillus amyloliquefaciens, suspoemulsion, carrier, inert ingredients, control efficacy

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