Shown that various pericarp of sugar beet hybrids contain a substantial amount of phenolic compounds which are represented by hydroxycinnamic acids, flavonoids and coumarins. Contained in the fruits of sugar beet triterpenoid saponins enhance the action of phenolic substances, creating complex system of protection of beet sprouts from the negative impact of biotic factors. The model of the functioning of biochemical regulation of seed germination and the formation around the pericarp phytoactive areas, performing the function of the protection system of seedlings from potential competitors and pathogens. A complex reaction of biological activity for water extracts of pericarp in relation to dicotyledonous plants, algae and root rots was established in the experimental data. This test can be used in the selection of sugar beet as a marker of potential resistance of genotypes to fungal and bacterial infections at the stage of seed germination.