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KMID : 0379119780060020019
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Korean Journal of Mycology
1978 Volume.6 No. 2 p.19 ~ p.24
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Studies on the Identification of Pythium spp . and Sclerotial Fungi isolated from Rice plants in Korea (2)
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Abstract
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Four species of Pythium and two species of Sclerotium previously not recorded in Korea during 1976 and Leptosphaeria salvinii which previosly reported but reidentified. Pythium aristosporm Vantery, Pythium sp. and Pythium myriotylum Drechsler were isolated from diseased rice seedlings and from green withered rice plants and Pythium irreglare Buisman was isolated from paddy soil. Three species of Pythium except P. irregulare grew well at 4℃ on Potato dextrose agar and were confirmed as highly pathogenic but P. irregulars showed low pathogenicity on Yushin variety of rice.
Sclerotium hydrophilum and Sclerotium oryzae-sativae appeared to be weakly pathogenic, but Leptosphaeria salvinii was confirmed as a highly pathogenic. Ordinally the two species of Sclerotium grew and produced many sclerotia on dead sheath and stems of rice. T here are still some problems to clarify and reconsider in regard to the pathogenicity of the sclerotial fungi because their populations were so very high in paddy fields, but their role might be wound parasite.
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KEYWORD
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