Abstract
Root‐colonizing fungi were isolated from a total of 663 root segments of Chinese cabbage plants grown in soils collected from wheat, rape, Chinese cabbage, and napier grass fields. Most of the 322 isolates were from the wheat field soil and comprised 18 genera and two septate fungal groups. Hyaline and dark septate fungi accounted for approximately half the isolates from the wheat field soil. Sixteen isolates almost completely suppressed clubroot in sterile soil. Amongst these 16 isolates, two fromHeteroconium chaetospirawere also effective in nonsterile soil. Chinese cabbage seedlings from seed treated with these two isolates appeared healthy, and inoculation with one isolate promoted growth. Hyphae of the fungus covered the root surface and extensively colonized the inner cortical tissues.
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