[Objective] This study aimed to investigate the phenotypic characteristics of Phytophthora infestans from Guizhou Province.[Method] The metalaxyl resistance,mating type and isozyme genotype of 292 P. infestans strains isolated from Guizhou Province were analyzed.[Result] Metalaxyl-resistant P. infestans strains were found in different areas of Guizhou Province. Resistant,moderately resistant and susceptible strains accounted for 35. 62%,33. 90% and 30. 48%,respectively. Both mating types A1 and A2 were found,which accounted for 65. 38% and 34. 62%,respectively. P. infestans strains isolated from Guizhou Province mainly belonged to Gpi genotypes 100 /100 and 100 /100 /111,accounting for 50. 68% and 43. 84%,respectively.[Conclusion]This study provides the theoretical basis for the prevention and control of potato late blight in Guizhou Province.
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