KMID : 0379120050330020089
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Korean Journal of Mycology 2005 Volume.33 No. 2 p.89 ~ p.91
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Occurrence of Gray Mold on Hypericum ascyron Caused by Botrytis cinerea in Korea
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Kwon Jin-Hyeuk
Son Kyoung-Ae
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Abstract
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In April of 2003 to 2004, the gray mold disease caused by Botrytis cinerea on Hypericum ascyron was occurred in the exhibition field of Gyeongsangnam-do Agricultural Research and Extension Services, at Hamyang-gun in Korea. The disease symptoms were started with water-soaking lesions in stem and the infected plants became withered, discolored and died. The conidia and mycelia of the pathogen appeared on stems of infected plants. The conidia were 1-celled and mostly ellipsoid or ovoid in shape and their color was light gray. The size of conidia was $4{\sim}16\;{\times}\;3{\sim}8\;{\mu}m$ and that of conidiophores was $12{\sim}26\;{\mu}m$ respectively. The pathogen formed sclerotia abundantly on potato-dextrose agar. The optimum temperature for sclerotial formation was $20^{\circ}C$. Pathogenicity of the causal organism was proved according to Koch¡¯s postulate. The causal organism was identified as Botrytis cinerea based on mycological characteristics. This is the first report on gray mold of H. ascyron caused by B. cinerea in Korea.
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KEYWORD
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Botrytis cinerea, Gray mold, Hypericum ascyron
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