Weed & Turfgrass Science

The Korean Society of Weed Science & The Turfgrass Society of Korea Archive (한국잡초학회 & 한국잔디학회)
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Occurrence of Brown Patch on Kentucky Bluegrass Caused by Rhizoctonia solani AG-1 IB

Rhizoctonia solani AG-1 IB에 의한 Kentucky Bluegrass 갈색잎마름병 발생

  • Chang, Taehyun (Plant Resources and Environment Major, College of Ecology & Environmental Sciences, Kyungpook National University) ;
  • Lee, Yong Se (Division of Life and Environmental Science, Daegu University)
  • 장태현 (경북대학교 생태환경대학 식물자원환경전공) ;
  • 이용세 (대구대학교 생명환경과학부)
  • Received : 2013.02.15
  • Accepted : 2013.03.11
  • Published : 2013.03.31
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Abstract

Brown patch caused by Rhizoctonia solani AG-1 IB occurred on Kentucky bluegrass during late May through early October 2010 at golf course in Gyeongbuk Province, Korea. Disease symptoms on the turfgrass for spring season were leaf blights dying from the leaf tip, which appeared patches of brown color in the field. However, it appeared patches of dark brown color or gray brown color in fall. The fungus (B-7 isolate) of brown patch was isolated from the diseased leaf tissue and cultured on potato-dextrose agar (PDA) for identification. The young hyphae had acute angular branching and few septa and mature hyphal branches showed about 90-degree angles and development of monilioid cells, which were morphologically identical to Rhizoctonia solani AG-1 IB reported previously. DNA sequences of ribosomal RNA gene (internal transcribed spacer) of the fungus were homologous with similarity of 99% to those of Rhizoctonia solani AG-1 IB isolates in GenBank database, confirming the identity of the causal agent of the disease. Pathogenicity of the fungus was also confirmed on the creeping bentgrass and Kentucky bluegrass by Koch's postulates. This is the first report of brown patch on Kentucky bluegrass caused by Rhizoctonia solani AG-1 IB in Korea.

Rhizoctonia solani AG-1 IB에 의한 갈색잎마름병(brown patch)이 경북 청도에 있는 골프장에서 2010년 5월 하순과 10월 초순에 Kentucky bluegrass에서 발생하였다. 봄철에 발병증상은 잎끝과 잎이 마르는 증상이 갈색의 patch 형태로 나타났다. 하지만, 가을철에는 검은 갈색과 회갈색의 patch 모양으로 나타났다. 갈색잎마름병의 곰팡이는 병든 잎에서 분리를 하였으며, 동정을 위하여 PDA에서 배양하였다. 어린 균사는 분지각이 좁은 형태와 격막이 있었고, 분지각이 $90^{\circ}C$인 성숙한 균사와 monilioid 세포가 발달된 것도 볼 수 있었다. B-7 균주의 리보소옴 RNA의 염기서열을 분석하여 유전자은행에 Rhizoctonia solani AG-1 IB 균주와 비교한 결과, 99% 상동성을 나타낸다는 것을 확인하였다. 병원성도 creeping bentgrass와 Kentucky bluegrass에서 Koch's 원칙에 따라 확인하였다. Kentucky bluegrass에 갈색잎마름병은 Rhizoctonia solani AG-1 IB에 의한 것임을 처음보고 한다.

Keywords

References

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