Biopreparations based on Diseases caused by pathogenic micromycetes and impact of herbicides lead to lower proCohn are promising environmentally friendly agents for plants protection under biotic and abiotic stresses. <...> Meanwhile it is important to search of bioregulators for application on sugar beet and identify the mechanisms of their actions for effective use. <...> KVS) rhizosphere, enzymatic activities in soil and leaves, sucrose content in roots and productivity under pathogenic and herbicides pressing. <...> It was revealed that Fitosporin-M, Albit, Vitaplan decreased the abundance and frequency of rhizosphere pathogenic species and thus lead to activation of useful microflora. <...> Partilularly, a total of 8 pathogenic micromycetes were found in control of which , , and at Vitaplan application and , and was found in the rhizosphere, in case of Albit there was only , , . . were identified. <...> After doubled treatment the abundance decreased 1.5-3.0-fold, and the frequency decreased 2.0-4.0-fold compared to control. <...> Catalase activity reflecting intensity of soil microbiological processes exceeded control from 1.4 to 3.7 times after the first treatment with Fitosporin-M and Albi, respectively, and from 1.4 to 1.2 times after the second one. <...> The data on increasing oxidoreductases and hydrolases activities in rhizosphere confirm this conclusion. <...> Also, biopreparations decreased activities of hydrolases in leaves and the activity of their inhibitors indicating induction of protective reactions against pathogens. <...> The maximum values were recorded when Fitosporin-M and Albit were used. <...> The protective actions of biopreparations were also indicated by activation of peroxidase in leaves up to 0.175-0.250 OD490 per 1 g. Furthermore Fitosporin-M supported a relatively high level after reintroduction indicating a prolonged action on the antioxidant system during vegetation. <...> The positive effect of biopreparations under pathogenic and herbicides pressing was reflected in increasing productivity and sucrose content in sugar beet roots, and the maximum effect was achieved after 2-fold treatment of sowings with Fitosporin-M. <...> Keywords: sucrose, pathogenic microbiota, herbicides pressing, resistance, productivity, The sugar beet ( Cohn based biopreparations, oxidoreductases, hydrolases, peroxidase, L. L.) is one of the most important industrial crops for sugar production [1]. <...> At the same time, its potential productivity remains unrealized because the plants are adversely affected by various stress factors of both biotic (diseases and pests) and abiotic (exposure to high and low temperatures, moisture <...>