Pathogens of potato (Solanum tuberosum L.) tuber (Phytophtora infestans) occurring in treatments with foliar fertilization

A b s t r a c t The paper presents the results of a three-year exact plot experiment (2008-2010) established in Bałcyny (NE Poland). Three potato cultivars were grown: medium-early ‘Adam’, me-dium-late ‘Pasja Pomorska’, and late ‘Ślęza’. The experimental factors were foliar fertilizers applied alone or in combination (Basfoliar 12-4-6, ADOB Mn, Solubor DF) and two levels of soil mineral fertilization (N1P1K1-80 kg N × ha-1, 80 kg P × ha-1, 120 K × ha-1; N2P2K2-120 kg N × ha-1, 144 kg P × ha-1, 156 K × ha-1). The experimental materials comprised potato tubers. The symptoms of soft rot (Pectobacterium carotovorum subsp. carotovorum), late blight (Phytophthora infestans) and dry rot (Fusarium spp.) were evaluated in 5 kg potato samples, and were expressed as the percentage mass of infected tubers. The rates of common scab (Streptomyces scabies) and black scur