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http://dx.doi.org/10.5423/RPD.2014.20.1.025

Mating Types of Phytophthora infestans Isolates and Their Responses to Metalaxyl and Dimethomorph in Korea  

Kim, Jeom-Soon (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
Lee, Young-Gyu (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
Kwon, Min (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
Kim, Ju-Il (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
Jee, Samnyu (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration)
Park, Kyeong-Hun (Ginseng Research Division, National Institute of Horticultural & Herbal Science, Rural Development Administration)
Publication Information
Research in Plant Disease / v.20, no.1, 2014 , pp. 25-30 More about this Journal
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 $1.0-5.0{\mu}g/ml$ 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 $5.0{\mu}g/ml$.
Keywords
Dimethomorph; Mating type; Metalaxyl; Phytophthora infestans; Potato;
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