Korean Journal Plant Pathology (한국식물병리학회지)
- Volume 13 Issue 3
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- Pages.139-144
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- 1997
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- 0256-8608(pISSN)
Phytophthora Diseases of Apple in Korea: Ⅰ. Occurrence of a Destructive Collar Rot Caused by P. cactorum
사과의 역병: Ⅰ. Phytophthora cactorum에 의한 줄기역병의 발생
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Lee, Hyeong-Jin
(Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administrarion) ;
- Cho, Weon-Dae (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administrarion) ;
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Kim, Wan-Gyu
(Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administrarion)
- Published : 1997.06.01
Abstract
A destructive collar rot of apple caused by a species of Phytophthora has widely occurred in Kyungbuk and less extended in Chungbuk, Chungnam and Chunbuk provinces of Korea. Significantly higher incidence of the disease was observed on cv. Fuji when M26 or M9 was used as dwarfing stocks. Incidence of the disease at several orchards in Uisung, Kunwi, Yesan and Muju ranged from 45 to 80%. Twenty-five isolates of the causal fungus were collected and all isolates were identified as P. cactorum on the basis of their cultural and morphological characters. The fungus produced markedly papillate and broadly ovoid deciduous sporangia both on agar and in water, and a short pedicel was attached to each sporangium. Oospores were readily formed on clarified V8 agar by single isolates and all the antheridia were paragynous. The fungus neither grew nor produced oospores under 5 and over 33
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