Abstract
A Pythium species (isolates A-1 and A-4) obtained from diseased carrot roots with water-soaked brown blot-like symptoms in Chiba Prefecture is slow in growth rate and it has specific pathogenicity only limited to carrot roots. It is morphologically characterized by formation of globose, subglobose or peanut-shaped hyphal swellings and predominantly single monoclinous clavate, crook-necked or various-shaped antheridia with transverse furrows and folds. This fungus was identified as P. sulcatum Pratt and Mitchell based on morphological and physiological characteristics.
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