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Effect of a cultivar and thermal treatment of seeds in selected vegetables at early growth phase on the sensitivity to infection by important fungal pathogens
Novotný, Čeněk ; Koudela, M. ; Svobodová, Kateřina ; Nedorost, L. ; Aust, R. ; Kocourek, F.
The methodology is focused on the effect of selected factors on the development of important vegetable illnesses: Alternaria brassicicola dark leaf spot of cabbage, A. dauci carrot leaf blight, and Botrytis aclada onion neck rot and Peronospora destructor onion downy mildew. In the case of A. brassicicola, A. dauci and B. aclada, the plants in a defined stage of development were infected by the strains of fungal phytopathogens originating from acknowledged collections. In the case of P. destructor the plants were infected by a fungal strain obtained from a field plant culture massively affected by this phytopathogen. The effect of the cultivar used and of the seed thermal treatment on the development of the above given phytopathogens was investigated. It was found that, in the case of the cultivars used, the interpretation of the results had to include the factor of the cultivar´s earliness that was important with respect to the resistance to the fungal pathogens.
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Effect of selected factors on the yield and health status of cabbage, carrot and onion
Koudela, M. ; Novotný, Čeněk ; Nedorost, L. ; Kocourek, F. ; Svozilová, L. ; Brožová, L. ; Doležalová, J. ; Kubíček, M.
The presented methodology summarizes the results of field experiments documenting that the selected factors influenced the development of important diseases, namely: 1. Alternaria blight cruciferous of head cabbage (in the years 2012-2013) (caused by Alternaria brassicicola) 2. Alternaria leaf spot of carrot (in the years 2012-2013) (caused by Alternaria dauci), and 3. Blight of onion and onion neck rot (in the years 2013-2014) (caused by Peronospora destructor and Botrytis aclada, respectively). The evaluated factors were: variety, crop density (carrot and onion, only), year and location. It is necessary to take into account the earliness of evaluated cultivars that also represents an important aspect of variety resistance to pathogens. In the annex, there are diagrams showing the course of air temperature and air humidity as well as the length of moistening period of leaves at both experimental locations in Troja and Svijansky Újezd in the individual years. Changes of these variables significantly influenced, in interaction with the other factors, the development of phytopathogenic fungi on the infected plants in the individual years.
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