The Study on the Interaction of Wheat Cultivars of Shaanxi Province and Isolates of Puccinia recondita f.sp.tritici Collected in Different Years in Shaanxi Province
Analyses were made on virulence frequency,virulence,formula,and reaction association by inoculating 34 wheat cultivars of Shaanxi Prov- ince respectively with a population of-146 isolates of Puccinia recondita f.sp.tritici collected during 1982—1987 in Shaanxi Proviuce. The result showed (1) 13 (72.2%) of the 18 widely released wheat eultivars were highly susceptible to leaf rust;(2) 9 of 12 sources of resistance showed to be valueless against leaf rust;(3) The result of analyses of virulence frequency,viru...