Fusarium spp. infection of spring barley in the Czech Republic and possibilities of integrated control of this disease
Tvaruzek, L.(Agricultural Research Inst. Kromeriz (Czech Republic). Dept. of Integrated Plant Protection)E-mail:[email protected]
Three hundred and sixty spring barley genotypes from the world gene collection were tested in a field trial under the artificial infection with conidia suspension of Fusarium culmorum. Six barley cultivars registered for growing in the Czech Republic were tested for DON-toxin accumulation after strong scab inoculation. The effect of plant treatment with a fungicide (tebuconazole 250 g/ha) was assessed. An infection level as well as DON content were significantly reduced by the application of the fungicide. There was significant influence of barley genotype on final reaction under conditions of inoculation and also with or without the fungicide spraying. The mean level of DON in the trial was 9.2 mg/kg, minimum concentration was 0.36 mg/kg DON and maximum reached 35.4 mg/kg DON. The lowest DON accumulation combined with zero incidence of powdery mildew (Blumeria graminis f. sp. hordei) and low and medium net blotch (Dreschslera teres) and low and medium net blotch (Drechslera teres) infection were found in cvs Princesse and Union Firlbecks. The possibilities of combining genotypically based resistance with the application of effective fungicides are discussed.
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