Dry flowable formulations of antagonistic Bacillus subtilis strain T429 by spray drying to control rice blast disease

文献类型： 外文期刊

第一作者： Meng, Xiangkun

作者： Meng, Xiangkun;Yu, Junjie;Yu, Mina;Yin, Xiaole;Liu, Yongfeng

作者机构：

关键词： Bacillus subtilis;Fungicide;Dry flowable;Rice blast;Spray drying

期刊名称：BIOLOGICAL CONTROL （ 影响因子：3.687； 五年影响因子：3.962 ）

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收录情况： SCI

摘要： Dry flowable formulations of Bacillus subtilis strain T429 with fungicidal activity against the rice blast fungus Magnaporthe grisea were synthesized by spray drying. Inert ingredients including wetting agents, dispersants, disintegrants, and adhesives that show good biocompatibility with B. subtilis T429 were obtained. The formulations were optimized by a four-factor and three-level orthogonal experiment. The optimal contents of the wetting agent AEO-5, dispersant NNO, disintegrant (NH4)(2)SO4, and adhesive CMC-Na were 1%, 9%, 5%, and 1% respectively, the filler kaolinite supplemented to 100%. The mixture was suspended in the fermentation broth of T429 at a ratio of 20% (m/v). After being ground in a ball mill for 3 h, the suspension was spray-dried, and the dry flowable formulations were obtained. The formulation showed good physical characteristics, such as high dispersibility and viability. After 12 months of storage at room temperature, it revealed long shelf life and high viability. Field tests in rice crops illustrated that dry flowable formulations at 50 and 75 g/667 m(2) concentrations were as effective as a commercial fungicide in controlling rice blast, control efficiency up to 77.6% and 78.5%, respectively. No significant differences in disease control efficiency were observed between the formulations and the chemical pesticide tricyclazole (79.5%). Overall, a new shelf-stable and effective dry flowable formulation of the biocontrol agent B. subtilis T429 was obtained by spray drying to control rice blast. (C) 2015 Published by Elsevier Inc.

分类号： S476

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