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Spectrum of pathogenic species of the Fusarium genus on red clover at locations of the Czech Republic in 1990

Spectrum of pathogenic species of the Fusarium genus on red clover at locations of the Czech Republic in 1990

Ochrana Rostlin 28(1): 9-15

At three locations of the Czech Republic in 1990, 50 isolates of Fusarium spp. were obtained from necrotic root tissues of red clover (Trifolium pratense L.), a majority of which belonged to four species. F. avenaceum was most abundant, followed in descending order by F. culmorum, F. oxysporum and F. solani. In all isolates, an artificial infection test was used to test virulence on red clover and lucerne (Medicago sativa) and after culture on liquid media and also phytotoxicity of their culture filtrates to these crops. The ability to induce the pathogenic process on the plant ranged from avirulence to maximum virulence. Both crops reacted similarly, as suggested by the correlation coefficient of 0.77++. F. culmorum was the most virulent species on red clover, on lucerne these were F. culmorum and F. avenaceum. The correlation between the level of phytotoxicity of filtrates to clover and lucerne was not so high (0.35+). The correlation analysis assessing the relationship between the level of virulence and the degree of phytotoxicity revealed negative values of correlation coefficients. This reveals the complexity of defining particular components of the pathogenic potential of microorganisms separately and emphasizes the need to continue studies of the pathogenic process.

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Accession: 002226951

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