Research in Plant Disease 2010;16(3):274-278.
Published online December 30, 2010.
강원지역 감자 역병균 Phytophthora infestans의 교배형 및 약제저항성 변화
박경훈, 류경열, 윤종철, 정규식, 김점순, 권민, 김병섭, 차병진
 
Changes of Mating Type Distribution and Fungicide-resistance of Phytophthora infestans Collected from Gangwon Province
Kyeong Hun Park, Kyoung Yul Ryu, Jeong Chul Yun, Kyu Sik Jeong, Jeom Soon Kim, Min Kwon, Byung Sup Kim, Byeong Jin Cha
Abstract
Potato late blight caused by Phytophthora infestans was the most constrain disease at potato cultivation areas. The mating type distribution and fungicides response of P. infestans were investigated to elucidate the changes of pathogen from Gangwon province. On the fungal isolates in 2006, 58.7% were A1 mating type and 41.3% were A2 mating type. In 2007, A1 mating type isolates increased to 93.3% and A2 mating type isolates were collected from Jinbu areas as much as 6.7%. About 234 isolates analysed for metalaxyl response, the results was resistance 73.7%, intermediate 18.8% and sensitive 7.5% in 2006. And it was resistance 59.4%, intermediate 4.0% and sensitive 36.6% in 2007. It meant that mating type distribution and fungicide response were very different over the collection sites. Minimal inhibition concentration (MIC) of dimethomorph examined with 126 isolates in 2006 and 106 isolates in 2007. MIC over 1.0 μg/ml was 56.3% in 2006 and it was 3.8% in 2007. The average EC50 value of P. infestans was 0.37 μg/ml in 2006, but it decreased to 0.12 μg/ml in 2007. Fungicides response and pathogenesis of P. infestans should be monitored continuously to enhance the chemical efficacy at potato fields.
Key Words: Dimethomorph, Mating type, Metalaxyl, Phytophthora infestans
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