• 제목/요약/키워드: zonate leaf spot

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Zonate Leaf Spot of Sorghum Caused by Gloeocercospora sorghi in Korea

  • Chul Heo;Kim, Jung-Nyo;Hyun, Ik-Hwa;Heo, Noh-Youl
    • The Plant Pathology Journal
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    • 제15권4호
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    • pp.242-246
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    • 1999
  • Gloeocercospora sorghi caused the zonate leaf spot on sorghum (Sorghum bicolor Moench) in fields in Korea. The zonate spots were conspicuous on sorghum leaves as circular, reddish purple bands alternating with tan or straw-colored areas, which formed a coarsely zonate pattern. The lesions often occurred in semicircular patterns along the margin of leaves. The fungus produced sporodochia on the surface of infected leaves in a moist chamber. The conidia, born in a pinkish to salmon-colored slimy matrix, were hyaline, elongate to filiform, straight or slightly curved, 3- to 17-septate, and of variable lenght (28-197 x 1.6-$3.4\mu\textrm{m}$). G. sorghi isolated from diseased leaves of sorghum caused characteristic reddish-brown water-soaked leaf spots when inoculated to seedlings.

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Cristulariella moricola에 의한 네군도단풍 둥근무늬낙엽병 (Zonate Leaf Spot of Acer negundo Caused by Cristulariella moricola in Korea)

  • 조성은;박지현;이상현;이향범;신현동
    • 식물병연구
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    • 제18권1호
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    • pp.45-48
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    • 2012
  • 저온다습한 날씨가 지속된 후의 2011년 8월 초순에 경기도 동두천시 소요산에서 겹둥근무늬와 조기낙엽 증상을 나타내는 네군도단풍이 발견되었다. 병든 잎의 뒷면에서 원뿔 모양이며 흰색의 분생포자가 다수 관찰되었다. 현미경 검경을 통하여 형태적 특징을 검토한 결과, 이 증상의 원인균은 Cristulariella moricola로 동정되었다. 상대습도 100% 및 $18{\pm}2^{\circ}C$의 조건에서 인공접종을 통하여 이균의 병원성을 증명하였다. 한편, 분리 균주의 internal transcribed spacer 영역의 염기서열을 분석하고 NCBI에 등록된 균의 염기서열과 비교함으로써 이 균이 C. moricola임을 증명하였다. 네군도단풍에 C. moricola의 감염에 의해 발생한 둥근무늬낙엽병은 우리나라에서 최초의 기록이다.

Incidences of Leaf Spots and Blights on Kiwifruit in Korea

  • Jeong, In-Ho;Lim, Myoung-Taek;Kim, Gyung-Hee;Han, Tae-Woong;Kim, Hong-Chul;Kim, Min-Ji;Park, Hyun-Su;Shin, Soon-Ho;Hur, Jae-Seoun;Shin, Jong-Sup;Koh, Young-Jin
    • The Plant Pathology Journal
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    • 제24권2호
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    • pp.125-130
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    • 2008
  • Various kinds of leaf spots and blights were found in kiwifruit (Actinidia deliciosa) orchards on 2006 in Korea. Disease incidences were quite variable between open-field and rain-proof shelter. Rate of diseased leaves was recorded as about 70% at open-field orchards in late season but use of rain-proof vinyl shelters alleviated the disease incidences by 20%. Angular leaf spots appeared at early infection stage on June and several other symptoms were also recognized as the disease developed afterward. On September, brown leaf blights were the most frequent, followed by grayish brown ring spots, silvering gray leaf blights, zonate leaf blights, dark brown ring spots and angular leaf spots at open-field orchards. Four fungal species were frequently isolated from the disease symptoms. Phomopsis sp. was the most predominant fungus associated with the leaf spot and blight symptoms on kiwifruit, followed by Glomerella cingulata, Alternaria alternata and Pestalo-tiopsis sp. Phomopsis sp. was commonly isolated from angular leaf spots, silvering gray leaf blights, and zonate brown leaf blights. G. cingulata, A. alternata and Pestalotiopsis sp. were isolated from grayish brown ring spots (anthracnose), brown ring spots and zonate dark brown leaf blights. Typical symptoms appeared on the wounded and unwounded leaves, which were inoculated by each of Phomopsis sp., G. cingulata, and Pestalotiopsis sp., but A. alternata caused symptoms only on the wounded leaves.

Occurrence of Target Leaf Spot of Red and White Clovers Caused by Stemphylium sarciniforme in Korea

  • Cho, Hye-Sun;Yu, Seung-Hun
    • The Plant Pathology Journal
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    • 제16권6호
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    • pp.328-330
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    • 2000
  • A terget leaf spot of red and white clovers was observed during 1998-2000 growing seasons in several fields of Chungnam and Chungbuk provinces in Korea. Lesions were circular to oval in outline, brown to dark brown, ranging from a pinpoint to 3-4 mm in diameter, often concentrically zonate and presenting a target effect. A fungus associated with the disease was identified as Stemphylium sarciniforme based on the morphological characteristics of the conidiophores and conidia. The fungus was pathogenic on red and white clovers in the inoculation test. This is the first record of a terget leaf spot of red and white clovers in Korea.

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