Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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'Kresek' Disease in Korea. I The Grouping of the Pathogens and Reproduction of 'Kresek'

한국에 있어서의 'Kresek'에 관한 연구 I 'Kresek' 발생지의 병원균 균형 및 병징 재현에 관한 시험

  • Choi Yong Chull (Institute of Agricultural Sciences, Office of Rural Development) ;
  • Cho Eng Haeng (Institute of Agricultural Sciences, Office of Rural Development) ;
  • Chung Bong Jo (Institute of Agricultural Sciences, Office of Rural Development) ;
  • Cho Yong Sup (College of Agriculture, Seoul National University) ;
  • Yoo Yeon Hean (College of Agriculture, Seoul National University)
  • 최용철 (농촌진흥청 농업기술연구소 병리연구담당관실) ;
  • 조응행 (농촌진흥청 농업기술연구소 병리연구담당관실) ;
  • 정봉조 (농촌진흥청 농업기술연구소 병리연구담당관실) ;
  • 조용섭 (서울대학교 농과대학) ;
  • 유연현 (서울대학교 농과대학)
  • Published : 1977.03.01
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Abstract

The 'Kresek' disease in Korea caused by Xanthomonas oryzae was first found from eight counties in Jeon-nam and Kyungnam province in 1976. The study has been carried mainly on the grouping of pathogens and reproduction of the symptoms on Milyang #23, the variety had shown severe damages at the fields, by using the isolates from Hwa-sun and Kwang-san counties where the first epidemics took place. 1. The 'Kresek' disease was found mainly on Milyang #23, a new variety, at Hwa-sun, Mu-an, Kang-jin. Yung-am, Gog-sung counties in Jeon-nam province and Jin-yang county in Kyung-nam province. 2. The groups of 'Kresek' causing pathogens were the same of those producing bacterial leaf blight symptoms such as group I , II, IN and V of Xanthomonas oryzae. 3. Seventeen out of 21 isolates from Hwa-sun county where the first and severe damage found belonged to group IV, 2 to group II and 2 to group V All of 5 isolates from Kwang-san county belonged to the group IN. 4. The 'Kresek' type symptom could reproduced within 5 days after inoculation to seedlings by using root tut, spray and needle inoculation methods. j. The most of effective method for the inoculation was root cut, and then were spray and needle method. respectively. The higher concentration of inoculum produced the higher disease incidence.

우리나라에서 처음 발생되었던 Kresek에 과한 발생의 균형 및 재현에 관한 시험결과는 다음과 같았다. 흰빛잎마름병균에 의한 Kresek 현상은 주로 남부방인 전라남도 화순, 무안, 강진, 영암, 곡성, 광산, 경상남도 진양군에서 볼 수 있었다. Kresek 발생지의 병원균의 균형은 I, II, IV, V군에 의한 발생을 나타냈다. 3. Kresek이 가장 심하였던 화순군에서는 21균주중 17균주는 IV군, 2균주는 II군, 2균주는 V군이었으며 광산군의 5균주는 IV군dp 속하는 균주였다. 4. 화순군에서는 II, IV, V군이 혼재하고 있음을 볼 수 있었다. 5. Kresek 재현에 관한 시험에서는 접종 5일만에 발병을 볼 수 있었으며 뿌리 절단법에서 발병율이 현저히 높았고, 분무접종, 침접종에서도 발병을 볼 수 있었다. 6. 병원균농도가 높을수록 발병이 많았다.

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