Streptomyces pseudovenezuelae agent for preventing and treating tobacco black shank and preparation method thereof

Abstract

This invention discloses a *Streptomyces pseudograysus* agent for controlling tobacco black shank disease and its preparation method, which relates to the field of tobacco black shank disease control technology and solves the technical problems of pesticide residues and environmental pollution caused by the use of chemical pesticides to control tobacco black shank disease in the prior art. The preparation method includes the following steps: using *Streptomyces pseudograys* YWF-21-2116 as the strain, the strain is activated; the *Streptomyces pseudograys* YWF-21-2116 strain is cultured to obtain primary seed liquid of *Streptomyces pseudograys* YWF-21-2116; the primary seed liquid of *Streptomyces pseudograys* YWF-21-2116 is cultured to obtain secondary seed liquid of *Streptomyces pseudograys* YWF-21-2116; the secondary seed liquid of *Streptomyces pseudograys* YWF-21-2116 is cultured to obtain fermentation broth of *Streptomyces pseudograys* YWF-21-2116, and the fermentation broth of *Streptomyces pseudograys* YWF-21-2116 is the *Streptomyces pseudograys* inoculant for controlling tobacco black shank disease. The microbial agent of this invention can not only effectively control black shank disease, a soil-borne disease of tobacco, but also avoid delaying the golden period of early prevention and control due to incorrect selection of pesticides in agricultural production.

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