ارزیابی مقاومت نسبی لاین ها و ارقام پیشرفته کلزا نسبت به بیماری پوسیدگی اسکلروتینیایی ساقه

Evaluation of Relative Resistance of Rapeseed Lines and CuJtivars to Rot. . Sclerotinia Stem rot Sclerotinia stem Tot of rapeseed caused by Sclerotinia sclerotiorum is considered as one of the most important diseases of this crop in the North of Iran. . . Genetically resistant sources, because of the compatibility with the other premunition and control ways, have paramountly important. In this investigation, reaction of 4 lines and 21 cultivars were evaluated using the fungal mycelium coated wheat seeds method, in a single lattice design (5 x 5 ) at bayekola research station of Neka township for two years . Reaction of germplasm was recorded at near the harvesting time, on tbe basis of macroscopic symptoms. To assess relative resistance of germplasm quantitatively , a rating system of 1 ( resistant) to S ( vary susceptible) was introduced and the disease index ( DI ) on tbe basis of mean rating score for eacb germ plasm was calculated. The results at 1 % level, indicated that there is a significant difference among the gremplasm. Of all tested gernplams ,Foseto and Ebony were had highest and lowest. resistance to the disease respectively. Key words: Brassica napus , Rapeseed ,Slerotinia sclerot;orum, Sclerotinia stem rot

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