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Study on the Resistance of Phytophthora infestans in Potato to Metalaxyl

Li Wei(Institute of Agro-physics, Plant Physiology and Biochemistry HAAFS, Shijiazhuang 050051)Zhang Zhiming; Li Chuan(Department of Plant Protection,HAU,Baoding 071001)Gu Zenghui(Plant Protection Station of Shijiazhuang, Shijiazhuang 051003)  
The experiment with metalaxyl-sensitive (MS), metalaxyl- intermidaely-resistant (MIR) and metalaxyl-high- resistant (MHR) isolates of Phytophthora infetans were compared. The results showed the maintainence and subculture did not change their sensitivity to metalaxyl of resistant isolates. In the absence of metalaxyl for fitness on potato leaves and tubers of cv. Weishu,No. 1. MHR produced significantly largr leisons thar MS. And subculature did not change their senstivity to metalaxyl of resistant isolates. In the absence of metalaxy for fitness on potato leaves and tubers of cv. Weishu. No. 1. MHR produced significantly larger leisons than MS and MIR isolates, but no siginficantly differences were obsevered on infection frequency. On the whole, MHR isoates exhibited higher fitness. The ability of P. infestans to overseason in potato tubers differed at 4℃, 12℃, 18℃, 25℃. The significantly higer recovery that of MS isolates of P. infestens from Potato tubers than of MR isolates explained the rapid reduction of MR isolates in the field in the absence of phenylamide fungicides.
【CateGory Index】: S435.32
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