• 제목/요약/키워드: Collar rot

검색결과 18건 처리시간 0.015초

Sclerotium rolfsii에의한 잇꽃 흰비단병 (Collar Rot of Safflower Caused by Sclerotium rolfsii)

  • 권진혁
    • 식물병과 농업
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    • 제5권2호
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    • pp.119-121
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    • 1999
  • A destructive collar rot of safflower occurred severely research farm of at Kyongsangnam-do Agricultural Research and Extension Services in 1999. Incidence of the disease at 3 fields in Chinju was ranged from 21.6 to 34.2% Upper parts of infected stems were mostly blighted and white mycelia were found on the lesions. The same fungus was isolated consistently from the infected tissues and confirmed its pathogenecity to safflower. The causal fungus of collar rot disease was identified as Sclerotium rolfsii by the examination of colony type sclerotium formation and pathogenicity test. This fungus also causes stem rot crown rot wilt or blight on the safflower. This is the first report on the collar rot of safflower caused by Sclerotium rolfsii in Korea.

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Pathogenicity of Macrophomina phaseolina and Fusarium verticilloides in Okra

  • Begum Mashooda;Lokesh S.;Kumar T. Vasanth
    • Animal cells and systems
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    • 제9권1호
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    • pp.37-40
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    • 2005
  • In okra Macrophomina phaseolina and Furasium verticilloides cause collar-rot, seedling-rot and other severe diseases at fruit maturing stages. These stages were located in all the components of the seeds. The seeds collected from seeds infected with Macrophomina phaseolina and Fusarium verticilloides revealed 100% infection. Such seeds resulted in pre- and post-emergence mortalities. Inoculated seeds also showed pre- and post-emergence death of the seedlings. The fungi seed-transmitted showed disease symptoms at different growth of okra plant. Fusarium verticilloides causes the wilt and Macrophomina phaseolina causes the collar-rot. Until now seed transmission of these fungi have not been studied. Hence, in the present study an attempt has been made to fill this lacunae.

Sclerotium rolfsii에 의한 미나리 흰비단병 발생 (Occurrence of the Collar Rot of Water Cress (Oenanthe javanicav) Caused by Sclerotium rolfsii)

  • 권진혁;강수웅;박창석
    • 한국균학회지
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    • 제29권1호
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    • pp.72-74
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    • 2001
  • 2000년 9월 상순경 경상남도 의령군 가례면 밭 미나리 재배포장에서 미나리 흰비단병(Sclerotium rolfsii)이 대발생하였다. 이 병의 병징은 미나리 줄기 절단부가 갈색으로 변하고 물러져 썩으며 그 위에 흰색의 곰팡이가 솜털처럼 밀생하고, 병발부위에 작은 갈색의 둥근 균핵을 형성하며 지제부 부근의 토양 표면에도 형성되었다. 균사의 폭은 $4.1{\sim}10.3{\mu}m$이고, 균사 생육적온은 $30^{\circ}C$에서 90.0 mm로 가장 잘 자랐으며 $5^{\circ}C$$45^{\circ}C$에서는 자라지 않았다. PDA 배지상에는 $20^{\circ}C$에서 균핵을 많이 형성하였다. 균총의 색깔은 흰색이며 clamp connection이 있는 것이 특징이다. 균핵의 모양은 구형이며 크기는 $1.0{\sim}6.3{\times}10{\sim}5.2mm$ (평균 $2.4{\sim}2.2mm$)이었다. 이 병원균을 Sclerotium rolfsii로 동정하였고, 미나리 흰비단병으로 명명할 것을 제안한다.

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사과의 역병: Ⅰ. Phytophthora cactorum에 의한 줄기역병의 발생 (Phytophthora Diseases of Apple in Korea: Ⅰ. Occurrence of a Destructive Collar Rot Caused by P. cactorum)

  • 지형진;조원대;김완규
    • 한국식물병리학회지
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    • 제13권3호
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    • pp.139-144
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    • 1997
  • 사과 줄기 밑둥을 썩히는 역병 (collar rot)이 경북의 사과 재배지역에 널리 발생하고 있으며, 충북, 충남, 전북 등의 일부 지역에서도 발생이 확인되었다. 이 역병은 주로 M26이나 M9를 왜성대목으로 사용한 후지품종에 심하게 발생되었는데, 발병율은 포장에 따라 큰 차이를 보이지만 의성, 군위, 예산, 무주 등지의 일부 포장에서는 이병주율이 45~80% 정도로 아주 높았다. 수집된 25 균주의 균학적 특성을 조사 결과 모두 Phytophthora cactorum으로 동정되었는데, 이들은 배지에서나 물 속에서 유두돌기가 뚜렷하며, 계란형의 쉽게 이탈되는 다량의 유주자낭을 형성하였고 짧은 자루 (약 4 ${\mu}m$)를 부착하고 있었다. 자웅동주 균으로 10% clarified V8 배지에서 다량의 난포자를 형성하였는데 모든 장정기는 측착 (paragynous) 하였다. 모든 공시 균주는 5$^{\circ}C$ 이하와 33$^{\circ}C$ 이상에서는 자라지 못하였으며 난포자도 형성되지 않았다. Phytophthora cactorum에 의한 사과 줄기역병은 국내에서 기록된 바가 없어 본 병해를 최초로 보고하는 바이다.

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Sclerotium rolfsii에 의한 잠두 흰비단병 발생 (Collar Rot of Broad Bean (Vicia faba) Caused by Sclerotium rolfsii)

  • 권진혁;김태성;강수웅;박창석
    • 한국균학회지
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    • 제29권2호
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    • pp.131-133
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    • 2001
  • 2001년 경상남도 남해군 창선면 잠두 재배포장에서 줄기가 부패하고 주위에 흰곰팡이가 발생하는 병이 관찰되었다. 이 병의 병징은 지제부가 암갈색으로 변하고 그 위에 흰색의 곰팡이가 솜털처럼 밀생하고, 병반 부위에 갈색의 둥근 균핵을 많이 형성하며 지제부 부근의 토양 표면에도 형성되었다. 병원균은 PDA 배지 상에서 $30^{\circ}C$에서 가장 잘 자랐으며 균사생장 중에 특유의 clamp connection이 관찰되었다. PDA 배지에서 갈색 또는 암갈색을 띤 구형 또는 부정형의 많은 균핵을 형성하였으며, 균핵의 크기는 $1.0{\sim}3.7{\times}1.0{\sim}2.8\;mm$(평균 $1.0{\sim}2.3\;mm$)였다. 병원균의 특징과 병원성을 검정한 결과 이 병을 Sclerotium rolfsii에 의한 잠두 흰비단병으로 명명하고자 한다.

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둥굴레에 흰비단병을 일으키는 Sclerotium rolfsii에 관하여 (Sclerotium rolfsii Causing Collar Rot on Doonggulle (Polygonatum odoratum var. pluriflorum))

  • 권진혁;강수웅;박창석
    • 한국균학회지
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    • 제28권2호
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    • pp.121-122
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    • 2000
  • 경상남도농업기술원 함양약초시험장 포장에 발생한 병든 둥굴레로부터 병원균을 분리하여 병원균의 특성과 병징을 토대로 Sclerotium rolfsii에 의한 둥굴레 흰비단병을 동정하였다. 이 병의 병징은 지제부가 암갈색으로 변하고 그 위에 흰색의 곰팡이가 솜털처럼 밀생하고, 병반부위에 갈색의 둥근 균핵을 많이 형성하며 지제부 부근의 토양 표면에도 형성되었다. 병원균은 PDA 배지 상에서 왕성하게 생장하였으며 균사생장 중에 특유의 Clamp connection이 관찰되었고 균사가 가장 잘 자랄수 있는 온도는 $30^{\circ}C$이였다. PDA 배지에서 시간이 경과되면 갈색을 띤 구형 또는 부정형의 많은 균핵을 형성하였는데 균핵의 크기는 $0.9{\sim}6.8{\times}0.6{\sim}5.2\;mm$ (평균 $2.7{\sim}2.3\;mm$) 이었다.

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Newly Recorded Problematic Plant Diseases in Korea and Their Causal Pathogens

  • Kwon, Jin-Hyeuk
    • 한국식물병리학회:학술대회논문집
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    • 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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    • pp.25-27
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    • 2003
  • Since 1993, a total of 50 problematic plant diseases unrecorded in Korea were surveyed in Gyeongnam province. Totally 34 new host plants to corresponding pathogens investigated in this study were 5 fruit trees, 9 vegetables, 12 ornamental plants, 3 industrial crops, and 5 medicinal plants. Among the newly recorded fruit tree diseases, fruit rot of pomegranate caused by Coniella granati and Rhizopus soft rot of peach caused by Rhizopus nigricans damaged severely showing 65.5% and 82.4% infection rate. Among the vegetable diseases, corynespora leaf spot of pepper caused by Corynespora cassiicola and the crown gall of pepper caused by Agrobacterium tumefaciens, powdery mildew of tomato caused by Oidiopsis taurica were the most severe revealing 47.6%, 84.7%, and 54.5% infection rate in heavily infected fields, respectively. In ornamental plants, collar rot of lily caused by Sclerotium rolfsii, gray mold of primula caused by Botrytis cinerea, soot leaf blight of dendrobium caused by Pseudocercospora dendrobium, sclerotinia rot of obedient plant caused by Sclerotinia sclerotiorum showed 32.7 to 64.8% disease incidence. On three industrial plants such as sword bean, broad bean, and cowpea, eight diseases were firstly found in this study. Among the diseases occurring on broad bean, rust caused by Uromyces viciae-fabae and red spot caused by Botrytis fabae were the major limiting factor for the cultivation of the plant showing over 64% infection rate in fields. In medicinal plants, anthracnose of safflower caused by Collectotrichum acutatum was considered the most severe disease on the plant and followed by collar rot caused by Sclerotium rolfsii.(중략)

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Stem Rot of Tawny Daylily(Hemerocallis fulva) Caused by Sclerotium rolfsii in Korea

  • Kwon, Jin-Hyeuk;Park, Chang-Seuk
    • Mycobiology
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    • 제32권2호
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    • pp.95-97
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    • 2004
  • In July 2002, a destructive stem rot of tawny daylily(Hemerocallis fulva) was occurred sporadically in exhibition farm of Gyeongsangnam-do Agricultural Research and Extension Services located in Hamyang-gun, Korea. The fungus also caused collar and crown rot, and systemic wilt or blight of whole plant. White mycelium spread over stems and petioles of infected plants and sclerotia were formed on the old lesions and near the soil surface. The optimum temperature for mycelial growth and scierotial formations was $30^{\circ}C$ on PDA. The mycelial width ranged $4.2{\sim}10.4{\mu}m$ and the color was white, usually many narrow mycelial strand grew in the aerial mycelium and formed clamp connection. The shape of sclerotia was spherical and $1.0{\sim}3.2$ mm in diameter. The fungus was isolated repeatedly from the infected tissues and confirmed its pathogenicity to Hemerocallis fulva and identified as Sclerotium rolfsii. This is the first report on the stem rot of H. fulva caused by S. rolfsii in Korea.

Stem Rot of Tatarian Aster(Aster tataricus) Caused by Sclerotium rolfsii in Korea

  • Kwon, Jin-Hyeuk;Park, Chang-Seuk
    • Mycobiology
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    • 제30권2호
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    • pp.102-104
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    • 2002
  • In July 2001, a destructive stem rot of tatarian aster(Aster taturicus) was occurred sporadically in exhibition farm of Gyeongsangnam-do Agricultural Research and Extension Services, in Hamyang, Korea. The fungus also caused collar and crown rot and systemic wilt or blight of whole plant. White mycelium spread over stems and petioles of infected plants and sclerotia formed on the old lesions and near the soil surface. The fungus showed maximum mycelial growth was obtained around $30^{\circ}C$ but did not grow below $5^{\circ}C$ or above $45^{\circ}C$. The mycelial width ranges $4.2{\sim}10.4{\mu}m$. and the color is white, usually many narrow mycelial stand grow in the aerial mycelium and formed clamp connection. Numerous sclerotia were formed in artificial media like PDA at $30^{\circ}C$. The shape of sclerotia were sphere and $1.0{\sim}3.2{\mu}m$ in diameter. The fungus was isolated repeatedly from the infected, tissues and confirmed its pathogenecity to aster and identified as Sclerotium rolfsii. This is the first report that Sclerotium rolfsii causes stem rot of tatarian aster in Korea.