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The resistance of 13 sunflower open-pollinate cultivars and three inner produced-hybrids to P. halstedii was evaluated, applying WSI method. In this
investigation, nine macroscopic disease symptoms namely damping-off, sporulation on cotyledons and true leaves, sporulation on true leaves, stunt,
sporulation on cotyledons, leaf mosaic or chlorosis. deformation, hypocotyl lesions, and root reduction on the inoculated plants were considered for rating
(Tab. 1). The cultivars and hybrids were classified in five groups according to the disease severity index (D.S.!.) and based on the rate of symptom
development as: resistant, moderately resistant, moderately susceptible, susceptible, and highly susceptible. The results showed that Golshid hybrid
and Progress cultivar, Azargol and Goldis hybrids and Peredovik and Gabor cultivars were resistant, moderately resistant and moderately susceptible,
respectively. On the other hand, Record, Cherneanka, Luch, Armaviresky. Vniimk 8931, Vniimk 6540, V-227, Mayak and N.S.P. 317 and Zaria cultivars
were evaluated as susceptible and highly susceptible, respectively.