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Abstract: The objective of this study is to determine some effective antagonistic fluorescent Pseudomonads (FP) for the biological control of the pathogens Papulaspora byssina, Cladobotryum dendroides, Pseudomonas tolaasii and Mycogone perniciosa. The selected FP strains, in respect to their nutritional and spatial competitive nature of antagonism were tested for their in vivo efficacy against the pathogens. As a result two strains (Pseudomonas fluorescens - M.15 and P. putida - 109) controlled the Brown Plaster disease at the rate 86.6% and 92.5%, respectively. Two applications with P. fluorescens - M 4/2, P. fluorescens - M 5/3 and P. putida - 39.a strains reduced the severity of disease caused by P. tolaasii by 87.34-90.5%, 71.3-71.7% and 67.5-72.6%, respectively. In the case of C. dendroides, FP strains P. fluorescens - M.15 and P. putida - 39.a provided 292.5 g/tray and 240.0 g/tray higher production, respectively, than the Control (+) per tray .None of the FP strains tested for M. perniciosa were effective in vivo. The study will progress by producing the bioformulations of the effective strains.
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