Evaluation of resistance of promising line (M-79-6) to common bunt in field conditions

Six cultivars of hexaploid wheat (Hyrmand, Shiraz, Pishtaz, Marvdasht, Mahdavi, Roshan ‎‎(susceptible check) and M-79-6) in subplots, and three seed treatments: I1 – seed without ‎treatment; I2- seeds artificially infected with bunt spores in 5/1000 ratio and I3- seeds treated ‎with Carboxin thiram FS in main plots of a split plot trial within a RCBD with three ‎replications and 3 locations of Karaj, Kermanshah and Neishabour were studied. Bunt efected ‎was measured using spike counting for every experimental plot. The data transformed to Arc ‎Sin [X1/2] and the means compared. In all locations seeds with bunt spores treatment produced ‎higher percentage of bunt infection. The varieties Roshan, Mahdavi, Marvdasht and Shiraz ‎showed high rates of bunt infection as susceptible varieties. The Hyrmand, Pishtaz and M-79-6 ‎showed trace infection and designated as resistant varieties. The cultivation of M-79-6, which ‎showed a high level of resistance to common bunt in temperate polluted areas could lead to ‎control disease and decrease operating cost of seed treatment.‎