Resistance evaluation of different sunflower cultivars to Sclerotinia sclerotiorum.

In order to identifing resistant to Sclerotinia sclerotiorum of sunflower varieties,two different media were used to culture S.sclerotiorum strains,and detached leaves of 40 different sunflower varieties were inoculated with the pathogen.The results showed that the growth rate of S.sclerotiorum mycelium was significantly reduced in the Minimal medium compared to PDA medium.After strain cultured in PDA medium inoculated sunflower leaves,the resistance level of the different sunflower varieties had no significant difference;while strain cultured in Minimal medium inoculated sunflower leaves,the different varieties demonstrated differences in resistance level.Among all tested 40 sunflowe cultivars,3 varieties showed resistance,such as 765,KS7;9 varieties showed tolerance,such as 3146;28 varieties were susceptible varieties,such as LD1093,Xinkuiza NO.6.