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Resistance to Metalaxyl in Phytophthora infestans in Populations in Potato Crops

Li Wei; Zhang Zhiming; Fan Muzhen (Dept. of Plant Protection, Hebei Agri. Univ., Baoding 071001)  
Samples of Potato leaves and tubers with late blight were collected in Weichang,Zhangjiakou of Hebei, Keshan of Heilongjiang, Neimeng and Gansu Provinces in 1994. 66 isolates were obtained, tested by spores inoculated on potato tuber disks dipped into the solutions of metalaxyl at different concs. The nurnber of sporangia had been detected after 7 days. 33. 3% isolates appeared to be high resistant, 43. 9% isolates intermidally resistant. Occurrence of resistance was accompanied by using of metalaxyl in these areas.
【CateGory Index】: S481
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