The present studies determined the effect of fungicide Miedzian 50 WP and grapefruit extract on the healthiness of pea and on the microorganism population in the rhizosphere of this plant. The number of plants grown from the seeds dressed with Grevit 200 SL was similar to, but no significantly, the number of plants obtained after the application of fungicide Miedzian 50 WP. The value of the infection index of plants was the lowest after the application of Grevit 200 SL, but not statistically different from that of Miedzian 50 WP. The following fungi were isolated from the infected plants: Alternaria alternata, F. culmorum, F. oxysporum, F. solani, Phoma eupyrena, Pythium irregulare, Rhizoctonia solani i Sclerotinia sclerotiorum. From the rhizosphere soil were isolated: Alternaria alternata, Fusarium spp., Gliocladium spp., Mucor spp., Penicillium spp., R.  solani, S. sclerotiorum i Trichoderma spp. The population of rhizosphere bacteria in the combinations with Grevit 200 SL and Miedzian 50 WP was significantly higher than in the control treatment. A reverse relationship occurred for the fungi population, but significantly the lowest number of fungi were found with Grevit 200 SL. Antagonistic microorganisms dominated in the rhizosphere of plants grown from the seeds dressed with Grevit 200 SL.

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