The most important pathogens transmitted by sugar beet
Milošević, Mirjana B. | Ignjatov, Maja V. | Medić-Pap, Slađana S.
Pathogenic fungi and viruses transmitted by sugar beet seed represent a complex group of organisms. Detection of these pathogens is an important issue in sugar beet protection. Their identification is a difficult task because the most available methods rely on the growth characteristics morphological and biochemical criteria. Three domestic and eight foreign sugar beet varieties, from Germany, Italy and Greece were included in the investigation. Seed health testing was performed in laboratory and in field conditions. During the trials, the following methods were used: blotter method, agar plate method and ELISA test for viruses. Seeds were incubated in "Conviron" aparatus at 22°C which is suitable for sporulation of different kind of fungi (light and temperature were adjustable). The appereance of following fungi was noted during incubation: Pleospora bjoerlingii (Phoma betae), Fusarium spp., Pythium spp. Aphanomyces cochlioides and Cercospora beticola. Viruses tested by ELISA test were beet necrotic yellow vein virus (BNYVV) and beet yellows virus (BYV). Viruses were tested in sugar beet seedlings grown in laboratory conditions and on leaves of individual plants from the field. The disease index was calculated on the basis of intensity of infection of plants for Cercospora beticola and Phoma betae according to Mc Kinney's formula. Results were presented by graphs, tables and original photos.
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