Verticillium dahliae Klebahn was isolated from various crops in Hokkaido. Most of the Verticillium isolates that had previously been identified as V. albo-atrum Reinke and Berth. or Verticillium sp. by other workers were also reidentified as V. dahliae Klebahn due to presence of microsclerotia, wide host range, possibility of growth at 30 C, and hyaline basal cells of conidiophore.
