The research was conducted in the years 1998-2001. The aim of the research was to determine the hea1th of the field pea ev. Kormoran grown in four various crop rotations and to determine the patogens causing the root-rot. On the pea it plants the following diseases were found: root rot (complex of fungi), ascochyta blight (Ascochyta pisi, Phoma pinodella, Mycospaerella pinodes) and fusarium foot rot (Fusarium spp.). All the diseases occurred in the highest intensity on the pea cultivated in three-field erop rotation without manure. The weather conditions affected the intensity of the diseases. From the roots of seedlings with the symptoms of root rot 44.7% of fungi with pathogenie potential in relation to pea were obtained. The most commonly isolated were Fusarium oxysporum (26.7% of all isolates), Rhizoctonia solani (10.7%), F. solani (3.3%), F. avenaceum (2.7%) and F. equiseti (1.3%). From the infected foot necks, 55.3% of potential pathogens of field pea were obtained. Among the isolates the most commonly found was F. oxysporum (31.1 % of all isolates).er fungi of the Fusarium genus constituted 15.4% of isolates, R. solani 7.0%, d Sclerotinia sclerotiorum 1.8%.
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