On the perfect stage of cultural type III B of Rhizoctonia solani kühn

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Isolates belonging to the cultural type IIIB (rush type) of Rhizoctonia solani Kühn developed their perfect stage by the soil method. Of 61 isolates belonging to the III B that was isolated from rush, rice, weeds and soil, 18 isolates developed the perfect stage. Percentages of fruited isolates of the III B were 31.1. They were measured length and number of sterigmata and dimensions of metabasidia and basidiospores. Metabasidia were barrel-shaped or obovate, 9.66-21.59×7.20-13.36μm as a whole of the III B. Sterigma were horn-shaped, 3.03-20.82μm, 4, rarely 2, 3, or 5 sterigmata per metabasidium. Basidiospores were obovate or ellipsoid, 6.17-12.85×4.63-8.22μm. The conditions of post-culture for development the perfect stage were tested. Hacchomuta-subsoil was effective for development of perfect stage as same as Nishigahara-subsoil. For development of perfect stage, the air condition over 20 C in daily mean in the periods of post-culture was necessary. And 24 C in daily mean was the most effective for it.
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