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Comparative studies of the causal fungi of sheath blight of rice plant corticium sasakii and black scurf of potato plant rhizoctonia solani part 1 pathogenicity to both potato and rice plants and types of disease spots formed on the leaf sheath of rice plant


Comparative studies of the causal fungi of sheath blight of rice plant corticium sasakii and black scurf of potato plant rhizoctonia solani part 1 pathogenicity to both potato and rice plants and types of disease spots formed on the leaf sheath of rice plant



Bulletin of the College of Agriculture and Veterinary Medicine Nihon University 32: 47-61



Comparative studies of the pathogenicity of the causal fungi of sheath blight of rice plant and black scurf of potato plant were made on both potato and rice plants. The types of disease spots formed by each on the leaf sheath of rice plant were also compared. On the rice plant and crimson clover, strains of C. sasakii caused partial brown discoloration of some sprouts and death of their affected parts without formation of hymenium; the young stems from the sprouts developed normally. Sclerotium formation was not observed on any underground part of the plant. The 2 strains of the fungus were only mildly pathogenic to the plant. Both isolates of R. solani from potato cultivars, 'May Queen' and 'Irish Cobbler' ('Danshaku'), showed strong pathogenicity to the potato plant; the lowest part of many stems of the plants underwent water-soaked-like degeneration and were covered with brown mycelial layers which formed the hymenia and later many sclerotia formed on underground parts, giving the characteristic black scurf signs and symptoms. Both strains of C. sasakii produced a high disease percentage in rice plants after sheath-inoculation but the 2 isolates of R. solani produced a very low disease incidence. The number of disease spots per rice stem with both strains of C. sasakii was comparatively large but with the 2 isolates of R. solani the number was very small. The 2 strains of C. sasakii induced typical sheath spot type disease spots on the leaf sheath of rice plant, while the 2 isolates of R. solani produced only dim brown spotlets quite different from those of C. sasakii. C. sasakii and R. solani are altogether different from each other in pathogenicity to rice and potato plants, in the types of symptoms shown with potato plant and in the type of disease spot formed on the leaf sheath of the rice plant.

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Comparative studies of the causal fungi of sheath blight of rice (Corticium sasakii (Shirai) Matsumoto) and black scurf of potato (Rhizoctonia solani Kuhn) - 1. Pathogenicity to both potato and rice plants and types of disease spots formed on the leaf sheath of rice. Bulletin of the College of Agriculture and Veterinary Medicine, Nihon University 32: 47-61, 1975

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