창조론 연대기에 대한 비교연구

권진혁 통합연구학회 1990 통합연구 Vol.3 No.1

Botrytis cinerea에 의한 나도풍란 잿빛곰팡이병 발생

권진혁,지형진,윤재길 한국식물병리학회 2006 식물병연구 Vol.12 No.3

Since 2004, a gray mold on Aerides japonicum Lindenb. & Reichb. caused by Botrytis cinerea occurred in a few greenhouses at Goseong and Tongyeong, Gyeongnam, Korea. The disease mainly started on the basal part of leaves, and often lead to severe rots of whole plant. Abundant grayish mycelia and conidial mats were visible on the lesions under a humid conditions. The light gray conidia were one celled and mostly ellipsoid or ovoid in shape. The conidia were 6~21 × 4~13 μm in size and conidiophores were 15~34 μm in length. The fungus formed abundant sclerotia on potato-dextrose agar after 18 days incubation at 20oC. The fungus was identified as Botrytis cinerea Persoon: Fries. based on its pathogenicity and mycological characteristics examined in this study. This is the first report of gray mold of Aerides japonicum caused by B. cinerea in Korea.

Sclerotium rolfsii에 의한 윤판나물 흰비단병

권진혁,심창기,박창석 한국식물병리학회 2007 식물병연구 Vol.13 No.1

From 2004 to 2005, the stem rot of Disporum sessile D. DON caused by Sclerotium rolfsii occurred sporadically in an herbs exhibition farm of Hamyang, Gyeongsangnam-do Agricultural Research and Extension Services, Korea. The typical symptom is water-soaking, dark brown on the stem and rotting, wilting. The infected plants were mostly died. White mycelial mats were spread over lesions, and then sclerotia were formed on stems and near soil line. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature and sclerotia on PDA was 30oC and the hyphal width was 3~10 μm. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. Pathogenicity of the causal organism was proved on D. sessile according to Koch’s postulate. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the stem rot of D. sessile caused by S. rolfsii in Korea.

Exobasidium japonicum에 의한 영산홍 떡병

권진혁,채윤석 한국식물병리학회 2006 식물병연구 Vol.12 No.3

Leaf gall was occurred on Rhododendron indicum (L.) Sweet [= Azalea indica L.] in a farmer's garden located in Geumsan-myon, and along the walk way of Gangju pond in Jeongchon-myon, Jinju, Korea. The infected leaves was deformed into very conspicuous, pale, fleshy shapeless galls. Basidia were fusiform, 3~5 sterigma, and 8~35 × 3~6 μm in size. Basidiospores were musiform, straight or curved and 10~22 × 3~5 μm in size. The causal organism was identified as Exobasidium japonicum Shirai based on the mycological characteristics of the fungus and pathogenicity. This is the first report on the leaf gall of R. indicum caused by E. japonicum in Korea.

Sclerotium rolfsii에 의한 수박 흰비단병 발생

권진혁,박창석 한국식물병리학회 2009 식물병연구 Vol.15 No.1

The fruit rot of watermelon (Citrullus lanatus) occurred sporadically in the farmers field at Chojeondong, Jinju city, Korea, in 2007. The typical symptom was water-soaked, brown on the fruit, and than infected fruits were mostly rotted. White mycelial mats were spread over lesions, and then sclerotia were formed on fruit and near soil line. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature for mycelial growth and sclerotia formation on PDA was 30oC and the hyphal width was 4~8 μm. The typical clamp connections were observed in the hyphae of the fungus. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii. This is the first report on the fruit rot of watermelon by S. rolfsii in Korea.

Rhizopus stolonifer에 의한 산딸기 무름병 발생

권진혁,쩐티펑지 한국식물병리학회 2008 식물병연구 Vol.14 No.2

Rhizopus soft rot caused by Rhizopus stolonifer on June, 2008 occurred on Rubus crataegifolius Bunge in the box at Jinju City Wholesale Market of Agricultural Products at Gyeongnam province in Korea. The infected fruits were rapidly water-soaked, softened, black and eventually rotted. The symptoms occurred after infecting wounds at harvest time. The colony were white to light brown, formed much sporangiospores. The optimum temperature of the fungus on potato dextrose agar was 30oC. Sporangiophores were 12~25 μm in width. Sporangia were globose or hemispheric, white at first and gradually to black, and 82~195 μm in size. Columella were hemispheric, and 70~92 μm in size. Sporangiospores were irregular round or oval, brownishblack and 9~21×7~8 μm in size. On the basis of symptom, mycological characteristics and pathogenicity of the fungus, the causal fungus was identified as Rhizopus stolonifer. This is the first report of Rhizopus soft rot by R. stolonifer on R. crataegifolius in Korea. Rhizopus soft rot caused by Rhizopus stolonifer on June, 2008 occurred on Rubus crataegifolius Bunge in the box at Jinju City Wholesale Market of Agricultural Products at Gyeongnam province in Korea. The infected fruits were rapidly water-soaked, softened, black and eventually rotted. The symptoms occurred after infecting wounds at harvest time. The colony were white to light brown, formed much sporangiospores. The optimum temperature of the fungus on potato dextrose agar was 30oC. Sporangiophores were 12~25 μm in width. Sporangia were globose or hemispheric, white at first and gradually to black, and 82~195 μm in size. Columella were hemispheric, and 70~92 μm in size. Sporangiospores were irregular round or oval, brownishblack and 9~21×7~8 μm in size. On the basis of symptom, mycological characteristics and pathogenicity of the fungus, the causal fungus was identified as Rhizopus stolonifer. This is the first report of Rhizopus soft rot by R. stolonifer on R. crataegifolius in Korea.

Sclerotinia sclerotiorum에 의한 팔손이 균핵병

권진혁 한국식물병리학회 2006 식물병연구 Vol.12 No.2

Sclerotinia rot was occurred on the leaf and stem of Fatsia japonica in Geoje city, Gyeongnam province in Korea from 2004 to 2005. The typical symptom of the disease was water-soaked infected leaves and stems. The colony of the isolated fungus was white to faintly gray in color. Apothecia were cup-shaped with numerous asci and 0.8~1.3 cm in size. Asci were cylindrical in shape and 70~220 × 4~18 μm in size. Ascospores were aseptate, hyaline, ellipsoid in shape, and 6~12 × 4~6 μm in size. Sclerotia formed on the plants and PDA medium were globose to cylindrical or irregular in shape, black in color. The optimum temperature for mycelial growth was 25oC. This is the first report on the Sclerotinia rot of Fatsia japonica caused by Sclerotinia sclerotiorum in Korea.

Sclerotium rolfsii에 의한 꽃향유 흰비단병 발생

권진혁,박창석 한국식물병리학회 2008 식물병연구 Vol.14 No.2

From 2006 to 2007, the stem rot of Elsholtzia splendens Nakai caused by Sclerotium rolfsii occurred sporadically in an herbs exhibition at Gyeongsangnam-do Agricultural Research and Extension Services, Korea. The typical symptom is water-soaking, dark brown on the stem and rotting, wilting and blighting. The infected plants were mostly died. White mycelial mats were spread over lesions, and then sclerotia were formed on stems and near soil line. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature and sclerotia on PDA was 30oC and the hyphal width was 4~9 μm. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the stem rot of E. splendens caused by S. rolfsii in Korea. From 2006 to 2007, the stem rot of Elsholtzia splendens Nakai caused by Sclerotium rolfsii occurred sporadically in an herbs exhibition at Gyeongsangnam-do Agricultural Research and Extension Services, Korea. The typical symptom is water-soaking, dark brown on the stem and rotting, wilting and blighting. The infected plants were mostly died. White mycelial mats were spread over lesions, and then sclerotia were formed on stems and near soil line. The sclerotia were globoid in shape, 1~3 mm in size and white to brown in color. The optimum temperature and sclerotia on PDA was 30oC and the hyphal width was 4~9 μm. The typical clamp connections were observed in the hyphae of the fungus grown on PDA. On the basis of mycological characteristics and pathogenicity to host plants, this fungus was identified as Sclerotium rolfsii Saccardo. This is the first report on the stem rot of E. splendens caused by S. rolfsii in Korea.

Sclerotinia trifoliorum에 의한 자운영 균핵병

권진혁,이용환,이흥수,심홍식 한국식물병리학회 2010 식물병연구 Vol.16 No.1

경남 고성군 자운영 재배포장에서 잎과 줄기가 수침상으로 무르고 썩으며, 시들어 말라 죽고 병든 부분에 흰색의 곰팡이와 균핵이 발생하였다. 감자한천배지 상에서 균총은 연한 회색이며 균핵의 모양은 구형이고 검은색으로 크기는 2~14×2~7 mm이었다. 균사 생육적온과 균핵 형성은 20℃이었다. 자낭반은 구형 또는 원반 모양이며 크기는 3~8 mm이었다. 자낭은 원통형이고 크기는 145~210×10~12 μm이었다. 자낭포자는 타원형이며 무색으로 크기는 10~14×6~7 μm이었다. 이상과 같이 자운영에 발생한 병징, 병원균의 균학적 특징 및 병원성 검정한 결과 Sclerotinia trifoliorum Eriksson에 의한 자운영 균핵병으로 동정하였다.

Rhizopus Fruit Rot Caused by Rhizopus oryzae on Strawberry

권진혁,강동완,윤해숙,곽연식,김진우 경상대학교 농업생명과학연구원 2014 농업생명과학연구 Vol.48 No.4

Rhizopus fruit rot was observed on strawberry fruit (Fragaria x ananassa Duchesne) grown ina glass greenhouse at the Gyeongsangnam-do Agricultural Research and Extension Services,Jinju, South Korea, from 2011 to 2013. Symptoms included water-soaking, rapid softening, androtting. When these symptoms were left untreated, vigorous fungal growth was observed on thesurface of infected fruits. Colonies on potato dextrose agar (PDA) at 30°C were white-cottonyto brownish-black. Sporangia were globose, black, and 40–210 ㎛ in diameter. Sporangiophoreswere light-brown and 6–22 ㎛ in diameter. Sporangiospores were globose to oval, brownish,streaked, and 4–12 ㎛ in length. Columellae were light brownish gray, hemispherical, and 80–120 ㎛ in diameter. To confirm the identity of the causal fungal pathogen, the complete internaltranscribed spacer (ITS) ribosomal RNA gene region was amplified and sequenced. Based onthese symptoms, mycological characteristics, pathogenicity tests on host plants, and molecularidentification, the fungus was identified as Rhizopus oryzae Went & Prinsen Geerligs. This isthe first report of Rhizopus fruit rot on strawberry caused by R. oryzae in Korea.