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Mating Type Distribution of Phytophthora infestans from The Haidong Region of Qinghai Province and Sensitivity to Metalaxyl

YE Guang-ji1,YANG Yong-zhi2,3,ZHOU Yun2,3,SUN Hai-hong2,3,LI Fang-di1 and WANG Jian2,3 (1.Qinghai University,Xining 810016,China;2.Institute of Biotechnology of Qinghai Academy of Agricuture and Forestry, Xining 810016,China;3.The Tibet Plateau Biotechnology Key Lab of Ministry of Education,Xining 810016,China)  
The isolates of Phytophthora infestans were collected from Haidong region of Qinghai Province from 2006 to 2007.The isolates were inspected for mating type distribution and sensitivity to Metalaxyl.The results showed that 70 isolates tested were all subjected to A1 mating sensitivity to Metalaxyl,91.43% were sensitive,85% were intermediate resistance,and 5.71% were highly resistance.The intermediate resistance isolates were distributed in Huzhu county,All the highly resistance isolates collected from tomatoes were distribution of Xunhua county and the northland of Xining.Most of the isolates collected from Haidong region were sensitive to Metalaxyl.
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