Research in Plant Disease 2005;11(1):72-76.
Published online June 30, 2005.
Phytophthora nicotianae에 의한 서향 역병
권진혁, 지형진, 박창석
 
Phytophthora Blight on Daphne odora Caused by Phytophthora nicotianae
Jin Hyeuk Kwon, Hyeong Jin Jee, Chang Seuk Park
Abstract
In 2002 and 2003, Phytophthora blight on Daphne odora occurred in fields at Waryong Mountain, Sacheon city, Korea. The disease usually initiated on the root and crown of the plant. Crown lesions began with light brown as water-soaking. Infection rate of the disease reached up to 60% in a heavily infested fields. The causal fungus was identified as Phytophthora nicotianae based on following mycological characteristics. Sporangium: readily formed in water, papillate, noncaducous, ovoid to spherical, 23~56×21~34 μm in size. Oogonium: spherical, smooth walled, 18~26 μm in size. Oospore: aplerotic, globose, 16~24 μm in size. Antheridium: amphigynous, unicellula, spherical. Chlamydospore: abundant, spherical, 16~32 μm in size. Sexuality: heterothallic. Optimum growth temperature was about 25~30℃. Pathogenicity of the isolate was confirmed on host plant and the fungus was identified as Phytophthora nicotianae. This is the first report of Phytophthora blight of Daphne odora in Korea.
Key Words: Daphne odora, Phytophthora blight, Phytophthora nicotianae


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