In order to provide scientific basis for breeding of resistant cultivars and its control in Gansu,resistance of different grape cultivars to Plasmopara viticola were determined through inoculating leaf plates indoors and disease survey in the field,and effects of leaf chlorophyll content on 8grape cultivar resistance to Plasmopara viticola was studied.The results showed that‘Zuirenxiang'‘Gaoqi'and‘Summer black'were resistant to Plasmopara viticola,‘Red globe'and ‘August'were slightly susceptive or susceptiv...