Náchylnost odrůd bramboru k patogenům Streptomyces scabiei, Thanatephorus cucumeris a Helminthosporium solani způsobujícím choroby hlíz

Susceptibility to three important pathogens causing potato skin diseases -- common scab, black scurf and silver scurf was studied in chosen varieties grown in the Czech Republic. The results were obtained in terms of severity and incidence of evaluated diseases for each variety and each year. The results made also possible to evaluate interactions of factors variety, earliness and year, mutual relationship among pathogens and secondary effect on presence of observed diseases, when the plants were treated with fungicides against late blight. None of varieties was resistant to observed diseases. The variety Mozart had the lowest average incidence of common scab, the variety Agria had this incidence the highest. The lowest incidence of black scurf was recorded for the variety Rosara, the highest for the variety Rebel. Belana was the best variety evaluated in the infestation of silver scurf, the worst was the variety Berber. The silver scurf caused by Helmithosporium solani was the disease with the highest incidence and also the highest severity of infestation of potato tubers what is unsuitable when the tubers are used for washing