Abstract
AbstractSoils from two long‐term crop rotation experiments were examined for incidence of root pathogens with a test tube method, where a great number (hundreds) of small portions (15–68g) of soil were biotested. There was a 4–5 times higher frequency of a root‐infecting Pythium sp. In barley monoculture soil when compared to crop rotation soil, where winter turnip rape was the preceding crop. In pathogenicity tests the isolated pathogen caused severe root rot on barley, wheat and rye, but did not affect growth of oats, maize, peas and winter rape. In all essential morphological characters it resembles P. arrhenomanes and we classify it as belonging to this species.
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