• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.134.1-134
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• 2003

Aecial host ranges of four Gymnosporangium species causing cedar-apple rust diseases, G. asiaticum, G. cornutum, 5. japonicum and G. yamadae, were investigated through artificial inoculation. Thirteen species of nine genera among Rosaceous plants, which have been reported as social hosts in Korea, were inoculated with fresh teliospores spores in early days of May of 2000 and of 2001, respectively. In the results, we re-confirmed that there was highly specific relationship between the rust species and aecial hosts and report new aecial hosts of four Gymnosporangium species. Teliospores of G. cornutum collected from Juniperus rigida successively produced spermogonia and aecia only on Sorbus alntifolia, the first report on host alteration of G. cornutum in Korea. Positive responses by teliospores of G. japonicum from J. chinenis of Suwon and from J. chinenis var. horizontalis of Jeju island were obtained only on P. villosa. Crataegus pinnatifida was confirmed as a new aecial host of G. viatium. Until this time, G. ymadae was believed to have Malus as the aecial host. However, teliospores of G. yamadae collected from J. chinensis var. kaizuka successively formed spermogonia and aecia on the leaves of Chaenomeles lagenaria, C. sinensis, Pyrus pyrtifolia var, culta, P. ussuriensis, Malus pumila and M. sileboldii. The date for maturation of spermogonia and aecia, and symptom development varied according to the rust fungi and aecial host plants, respectively.

• The Plant Pathology Journal
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• 제21권4호
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• pp.310-316
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• 2005

The objectives of this study were to identify the aecial host ranges of four Korean Gymnosporangium species, G. asiaticum, G. cornutum, Gjaponicum and Gyamadae, and to verify the morphological characteristics of telia as diagnostic keys to the species. Thirteen Korean Rosaceous woody species were artificially inoculated with teliospores obtained from Juniperus species. There was high specificity between telial and aecial hosts and the fungal species, providing the first experimental proof on host alternation of these rust fungi in Korea. Telia on the witches' broom and on the small galls were identified as new telial characteristics in G asiaticum and in G. yamadae, respectively. Aecial hosts of G. asiaticum and G. yamadae showed varying responses in their susceptibility and in the days required for formation and duration of spermogonia and aecia after inoculation. Four telial host species in Juniperus were confirmed for the first time in Korea, which include J. chinensis var. kaizuka, J. chinensis var. horizontalis and J. chinensis var. globosa for G. asiaticum; and J. chinensis var. kaizuka for G. yamadae.

• The Plant Pathology Journal
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• 제19권6호
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• pp.274-279
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• 2003

Two Gymnosporangium species, G. japonicum and G. cornutum, causing cedar-apple rust, were newly identified in Korea, and a new aecial host for each fungus was found by artificial inoculation. Detailed descriptions of the species were made based on macroscopic features (symptoms and signs) and light and scanning electron microscopic observations of spores and peridial cells. G. japonicum from Juniperus chinensis var. horizontalis had Photinia villosa as its new aecial host G. cornutum from J. rigida showed its aecial stage on Sorbus alnifolia.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.133.2-134
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• 2003

Cedar-apple rust fungi had been collected at 36 sites throughout the country from 1984 to 2001 and deposited at the Herbarium of Korea Forest Research Institute (HKFRI). We conducted the morphological examination on the dried specimens by light and scanning electron microscopy and as results six Gymnosporangium species were identified. Three species, G. asiaticum, G. clavaritforme and G. yamadae, were previously described in Korea, while the other three species, G. cornutum, G. globosum, and G. japonicum were new to Korea. Here we present the detailed morphological descriptions, distribution, host ranges and keys to species in both aecial and telial stages of each species. Some morphological characteristics related with telial formation on trees were newly identified; witches brooms for G. asiaticum, small galls for G. yamadae and telial formations on trunk for G. japonicun Geographically G. asiaticum and G. yamadae distributed widely throughout Korea, while the others were collected only at the limited locations. Eight Juniperus species as telial hosts and fifteen Rosaceous plants as aecial hosts were confirmed to be new in Korea.

• The Plant Pathology Journal
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• 제23권1호
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• pp.7-12
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• 2007

Perilla rust is a damaging disease in perilla cultivation in Korea. Its causal agent was identified as Coleosporium plectranthi based on descriptions of morphological characteristics of spores and spore-producing fruiting structures(in uredinial and telial stages from perilla and in aecial stage from the alternate host pine) collected in 15 locations in Korea during the disease survey from 2004 to 2006. These characteristics were yellow or orange uredinium; globose or ellipsoid urediniospore of $20.8{\mu}m{\times}18{\mu}m$ in size; verruca of $0.3mm{\times}1.2mm$; orange telium; one-celled, oblong ellipsoid teliospore of $63.1{\mu}m{\times}19.7{\mu}m$ with one-layered crusts or four-celled(when mature), internal basidium of $64.2{\mu}m{\times}19.7{\mu}m$; ellipsoid to globoid basidiospore of $20.3{\mu}m{\times}12{\mu}m$; type 2 spermogonium; yellow, broadly ellipsoid peridial cell of $35.6{\mu}m{\times}23.1{\mu}m$; and broadly ellipsoidal or subglobose aeciospore of $25.9{\mu}m{\times}18.8{\mu}m$. Phylogenetic analysis of 28S rDNA sequences revealed the closest relatedness to those of the genus Coleosporium, a monophyletic group distinguished from other rust fungi and divided into two main lineages, one of which was C. plectranthi grouped with high bootstrap value(96%). In pathogenicity test, both aeciospores and urediniospores caused rust development on perilla leaves. This is the first description of C. plectranthi causing perilla rust with the first findings of its telial stage on perilla and the first rust disease on the aecial host in Pinus densiflora. These aspects would provide basic information for the development of control measures of the disease.

• The Plant Pathology Journal
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• 제24권1호
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• pp.84-86
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• 2008

Field surveys and specimen collections of the rust fungal pathogen Gymnosporangium were carried out for 15 years from 1985 through 1999 in various locations of Korea. Macroscopic and microscopic examinations of morphological characteristics of aecia from the collected specimens revealed that Gymnosporangium globosum is the causal agent of American hawthorn rust disease on Crataegus pinnatifida and C. pinnatifida varmajor. The host plants are new for this rust fungus. G. globosum was found only in Gyeonggi and Chungbuk provinces, indicating that its distribution in Korea is limited. This is a first full description on morphological characters of aecia of G. globosum in Korea.

• 식물병연구
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• 제29권3호
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• pp.299-303
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• 2023

Rust symptoms on Meliosma myriantha trees have been noticed during disease surveys in Korea since 2010, with a high disease incidence frequently surpassing 90%. The causal fungus of the rust disease was identified as Neophysopella vitis based on the morphological investigation and molecular sequence analysis of the internal transcribed spacer (ITS) and large subunit (LSU) rDNA regions. This is the first report of rust disease caused by N. vitis on M. myriantha in Korea. A pathogenicity assay proved that M. myriantha serves as the aecial host of N. vitis as spermogonia and aeciospores were produced, which can infect the two uredinial hosts, Boston ivy (Parthenocissus tricuspidata) and Virginia creeper (Parthenocissus quinquefolia).

• 식물병연구
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• 제10권4호
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• pp.279-284
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• 2004

경상남도 진주와 하동지역의 산초나무 재배단지에서 잎녹병에 의한 피해가 매년 지속적으로 발생하고 있다. 산초나무 잎에 형성된 여름포자세대의 녹포자세대 기주를 밝히고 녹병균을 동정하기 위하여 본 병해의 발생지 주변 곰솔에서 채집된 녹포자를 산초나무에 인공접종하였다. 그 결과 산초나무에서 성공적으로 여름포자가 형성되어 이 녹병균은 녹포자세대를 곰솔에서, 여름포자 및 겨울포자세대를 산초나무에서 형성하는 장세대형 생활사를 갖는 C. xanthoxyli로 동정하였다. 대부분의 형태적 형질은 기존 기록과 일치하였으나 녹포자와 여름포자의 표면돌기 수에는 차이가 있었다. 곰솔과 산초나무에서 채집된 C. xanthoxyli의 건조표본을 이용하여 녹포자세대 및 여름포자세대의 형태학적 특징을 기술하였다. 경남 진주와 하동지역에서 조사된 산초나무에서의 최초 병발생시기는 6월 하순${\sim}$7월 초순이었으며 8월 중의 이병엽율은 17.8%${\sim}$58.7%이었다.

• 한국산림과학회지
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• 제62권1호
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• pp.76-81
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• 1983

우리나라 잣나무털녹병균(病菌)의 동포자기주(冬胞子寄主)는 송이풀류(類)이나 인공접종(人工接種)을 통(通)하여 까치밥나무류(類)도 중간기주(中間寄主)임이 이미 밝혀져 있다. 그러나 최근(最近)에는 병원균(病原菌)의 분포지역(分布地域)에 따라 기주(寄主)의 선택(選擇)과 병원성(病原性)을 달리하는 새로운 생태형(生態型)이 있는 것으로 추정(推定)되고 있어, 본(本) 시험(試驗)에서는 지역적(地域的)으로 격리(隔離)된 강원도(江原道) 평창(平昌)과 전북(全北) 남원지역산(南原地域産) 털녹병균(病菌)의 수포자(銹胞子)를 까치밥나무류(類)와 송이풀에 접종(接種)하였다. 그 결과(結果) 양지역(兩地域)의 털녹병균(病菌)은 공(共)히 Ribes montigenum 과 송이풀에 하포자퇴(夏胞子堆)를 형성(形成)함으로서, 동일(同一)한 병원성(病原性)을 나타냈다. 한편, 우리나라에 분포(分布)하는 잣나무 3종(種)을 털녹병피해임지내(病被害林地內)에서 자연감염(自然感染) 시킨 결과(結果), 4년후(年後)의 발병율(發病率)은 잣나무가 17.7%, 스트로브잣나무가 26.3%이였으나 섬잣나무는 전혀 발병(發病)되지 않았다. 따라서 우리나라의 털녹병균(病菌)은 전국적(全國的)으로 동일(同一)한 생태형(生態型)으로, 잣나무와 스트로브잣나무를 수포자기주(銹胞子寄主)로 하며, 송이풀류(類)와 까치밥나무류(類)를 동포자기주(冬胞子寄主)로 하고 있다.