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Botrytis cinerea에 의한 오크라 잿빛곰팡이병
최장남,최인영,이귀재,이정노,조성완,신현동,Victor Galea 한국식물병리학회 2018 식물병연구 Vol.24 No.4
From 2014 to 2016, approximately 5% of okra fruit were observed displaying gray mold symptoms at the research field of Jeollabuk-do Agricultural Research and Extension Services, Korea. The symptoms observed were water-soaked, brown or gray spots, and abundant mycelial with conidia appearing on the infected fruit. Initial infection commenced from the base of fruit and gradually moved to the pod, where it finally resulted in collapse. Colonies on potato dextrose agar were gray to grayish brown, felted and cottony expanding 65-80 mm after one week. The fungus formed several black sclerotia ranging 1.0-3.5×0.5-3.0 mm on the Petri dish after two weeks. The conidia were one-celled, ellipsoidal or ovoid, colorless or pale brown, and 6.2-15.4×5.0- 10.4 mm. Conidiophores arose solitary or in groups, straight or flexuous, septate, with an inflated basal cell brown to light brown, and measured 85-450×10.0-40.0 mm. On the basis of the morphological characteristics and phylogenetic analyses of internal transcribed spacer rDNA, the fungus was identified as Botrytis cinerea Pers. Pathogenicity of a representative isolate was proved by artificial inoculation, fulfilling Koch’s postulates. To our knowledge, this is the first report on the occurrence of B. cinerea on okra in Korea.
Plasmodiophora brassicae 에 의한 콜라비 뿌리혹병 발생
송민아,최인영,송정흡,이귀재,신현동,Victor Galea 한국식물병리학회 2019 식물병연구 Vol.25 No.1
From 2016 to 2018, approximately 15% of kohlrabi were observed displaying significant clubroot symptoms in farmer’s fields in Jeju, Korea. The initial infection appeared as hypertrophy of root hairs, and as the disease progressed, galls formation occurred on the main roots, finally disease progress resulted in yellowing and wilting of leaves. Pathogenicity was proven by artificial inoculation of plants with resting spore suspension, fulfilling Koch’s postulates. The resting spore is one-celled, spherical and subspherical, colorless, and 3-5 mm in diameter. On the basis of the morphological characteristics and phylogenetic analyses of internal transcribed spacer rDNA, the causal agent was identified as Plasmodiophora brassicae. To our knowledge, this is the first report on the occurrence of P. brassicae on kohlrabi in Korea.
Occurrence and Characterization of Leaf Spot Caused by Septoria melissae on Lemon Balm in Korea
Yang, Seon-Ah,Choi, In-Young,Ju, Ho-Jong,Lee, Kui-Jae,Galea, Victor,Shin, Hyeon-Dong The Korean Society of Mycology 2020 韓國菌學會誌 Vol.48 No.6
Leaf spot on lemon balm is frequently observed in Korea, causing considerable damage to crops. In 2014 and 2015, the occurrence of leaf spot was observed in several production greenhouses at Suwon, Gongju, and Namwon in Korea. Symptoms on lower leaves initially developed as small, distinct, discolored lesions, which enlarged progressively turning into dark brown, angular spots surrounded by purplish-brown margins. Based on the morphological characteristics and sequence analysis of actin (ACT), translation elongation factor 1-alpha (EF-1α), internal transcribed spacer (ITS), 28S nrDNA (LSU), and RNA polymerase II second largest subunit (RPB2), the fungus associated with the lemon balm leaf spot was determined as Septoria melissae. To the best of our knowledge, this is the first report of lemon balm leaf spot caused by S. melissae in Asia as well as in Korea.
Occurrence and Characterization of Leaf Spot Caused by Septoria melissae on Lemon Balm in Korea
( Seon-ah Yang ),( In-young Choi ),( Ho-jong Ju ),( Kui-jae Lee ),( Victor Galea ),( Hyeon-dong Shin ) 한국균학회 2020 Mycobiology Vol.48 No.6
Leaf spot on lemon balm is frequently observed in Korea, causing considerable damage to crops. In 2014 and 2015, the occurrence of leaf spot was observed in several production greenhouses at Suwon, Gongju, and Namwon in Korea. Symptoms on lower leaves initially developed as small, distinct, discolored lesions, which enlarged progressively turning into dark brown, angular spots surrounded by purplish-brown margins. Based on the morphological characteristics and sequence analysis of actin (ACT), translation elongation factor 1- alpha (EF-1a), internal transcribed spacer (ITS), 28S nrDNA (LSU), and RNA polymerase II second largest subunit (RPB2), the fungus associated with the lemon balm leaf spot was determined as Septoria melissae. To the best of our knowledge, this is the first report of lemon balm leaf spot caused by S. melissae in Asia as well as in Korea.
( Sung-hee Park ),( In-young Choi ),( Kyoung-won Seo ),( Jin-ho Kim ),( Victor Galea ),( Hyeon-dong Shin ) 한국균학회 2017 Mycobiology Vol.45 No.1
Leaf spot disease on black chokeberry (Aronia melanocarpa) was observed at several locations in Korea during 2014-2015. Leaf spots were distinct, scattered over the leaf surface and along the leaf border, subcircular to irregular and brown surrounded by a distinct dark color, and were expanded and coalesced into irregularly shaped lesions. Severely infected leaves became dry and fell off eventually. The causative agent was identified as Pseudocercospora pyricola. Morphological observations and phylogenetic analyses of multiple genes, including internal transcribed spacer, translation elongation factor 1-alpha, actin, and the large subunit ribosomal DNA were conducted. The pathogenicity test was conducted twice yielding similar results, fulfilling Koch`s postulates. To our knowledge, this is the first report on P. pyricola infection of A. melanocarpa globally.
Identification and Characterization of Cercospora malayensis Causing Leaf Spot on Kenaf
( Sung-hee Park ),( In-young Choi ),( Wang-hyu Lee ),( Kui-jae Lee ),( Victor Galea ),( Hyeon-dong Shin ) 한국균학회 2017 Mycobiology Vol.45 No.2
In September 2013 and 2014, a significant number of kenaf plants showing symptoms of leaf spots with approximately 50% incidence were found in experimental plots in Iksan and Namwon, Korea. Leaf spots were circular to irregular, more or less vein-limited, reaching to 10 mm in diameter. The spots were initially uniformly brown to reddish brown, turning pale brown with a purplish margin and showing grayish patches on the lesion due to heavy fructification. The causative agent of the leaf spot disease was identified as Cercospora malayensis. The pathogenicity test was conducted with similar results, which fulfilled Koch`s postulates. This is the first report of C. malayensis infection of kenaf in Korea.