The present invention belongs to the field of biopesticides, and more particularly, relates to Pseudomonas fluorescens biovar 1 ( Pseudomonas fluorescens biovar 1) PFB111 secreting an antimicrobial substance against actinomycetes (genus Streptomyces), the causative agent of potato beetle.; Pseudomonas fluorescens biovar 1 according to the present invention ( Pseudomonas fluorescens biovar 1) PFB111 is a simple facility capable of mass cultivation in a short time, the produced minute agent is less likely to be altered in the distribution process and can be easily used in farms, The PFB111 antagonistic bacterium was used to investigate the control effect of S. aeruginosa. As a result, it was found that there was more than 40% control effect in the test cloth severely caused by lime application.
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