The research makes an attempt to indicate agents useful for seed dressing of horse bean and soybean. In order to compare the effectiveness of control of root rot pathogens, laboratory and greenhouse experiments were carried out on three horse bean cultivars (Amulet, Albus and Granit) and three soybean cultivars (Augusta, Bohema and Merlin). Two agents of plant origin were used for seed dressing: Biosept 33 SL, containing grapefruit extract and garlic pulp, Polyversum WP, containing antagonistic organism Polyversum oligandrum, and synthetic seed dressing Vitavax 200 FS, whose active ingredients include carboxin and thiram. The greenhouse (pot) experiment was conducted to assess plant seedling emergence, percentage of infested plants and infection rate by root rot pathogens. Also weight of above-ground parts and roots was compared. The laboratory experiment analyzed seed germination energy and colonization by fungi. The obtained results demonstrated the possibility of using the examined seed dressings in ecological agriculture for root rot control.