Research in Plant Disease 2014;20(1):25-30.
Published online December 15, 2014.
감자 역병균(Phytophthora infestans)의 교배형과 metalaxyl 및 dimethomorph에 대한 반응
김점순1* · 이영규1 · 권민1 · 김주일1 · 지삼녀1 · 박경훈2
1국립식량과학원 고령지농업연구센터, 2국립원예특작과학원 인삼과
 
Mating Types of Phytophthora infestans Isolates and Their Responses to Metalaxyl and Dimethomorph in Korea
Jeom-Soon Kim1*, Young-Gyu Lee1, Min Kwon1, Ju-Il Kim1, Samnyu Jee1 and Kyeong-Hun Park2
1Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration, Pyeongchang 232-955, Korea
2Ginseng Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration, Eumseong 369-873, Korea
Correspondence:  <p>Jeom-Soon Kim</p><p>Tel : +82,

Jeom-Soon Kim

Tel : +82-33-330-1910
Fax: +82-33-330-1519
E-mail : kimjs33@korea.kr

Received: November 05, 2013   Revised: February 24, 2014   Accepted: March 10, 2014
Abstract
Phytophthora infestans was isolated from potato leaves collected from main potato producing areas in Korea during 2009-2011. In 2009, 99 isolates tested were all A1 mating type. Two of 64 isolates in 2010 and two of 78 isolates in 2011 were A2 mating type and they were found only in Miryang area. Among 99 isolates examined in 2009, 13.1% was resistant to metalaxyl, 3.1% was intermediate resistant and 83.8% was sensitive. In 2010, 19.4% of 62 isolates was resistant, 4.8% was intermediate and 75.8% was sensitive. Metalaxyl resistant, intermediate and sensitive isolates collected in 2011 were 23.1%, 9.0% and 67.9%, respectively. Metalaxyl resistant isolates increased mainly in winter cropping areas and seed potato producing areas where fungicides were sprayed more often. Frequencies of isolates showing minimum inhibition concentration of dimethomorph at 1.0-5.0 mg/ml were 17.2% in 2009, 19.0% in 2010 and 15.4% in 2011. However, there was no evidence for occurrence of resistant isolate to dimethomorph because no isolate was able to grow at 5.0 mg/ml.
Key Words: Dimethomorph, Mating type, Metalaxyl, Phytophthora infestans, Potato


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