This study aimed to evaluate the effects of various forms of biofertilizer applications on blackleg disease, Pectobacterium carotovorum subsp. carotovorum (Pcc), as well as the growth and development of potato plants. The experimental design was randomized blocks with the following forms of biofertilizer applications: in-furrow at planting, via foliar, in-furrow at planting + via foliar. The control treatment consisted of foliar applications of a chemical fungicide. In total the experiment consisted of four treatments and five replications. The evaluation of fresh and dry mass of leaves, stems and tubers, the length of the biggest stem, the number of stems and tubers was made via extraction of plants 49, 61, 73 and 85 days after planting. The incidence of blackleg disease was obtained by reviews every 15 days with the aid of diagrammatic scale. The harvest was carried out 106 days after planting followed by an evaluation of tuber yield and classification of tubers. The assessed forms of application did not significantly affect the productivity of tubers, which varied from 32-36 t ha -1 . However, the forms of application were significantly correlated with the incidence of the blackleg disease. The results indicate that foliar applications of biofertilizers can considerably control the blackleg disease and positively affect the growth of potato plants.