Chances of inoculum of pathogens for sugar beet in tare soils after different storages in lysi-meters and stacks – beet cyst nematode, soil-borne fungal root rot pathogens of beets, beet necrotic yellow vein virus
In a pluriannual study (1993-1998) tare soils of different origins were stored under equal conditions in lysimeters and stacks. The tare soils were sampled repeatedly and the potential of Heterodera schachtii, of soil-borne fungal root rot pathogens of beet, of beet necrotic yellow vein virus and others was determined. While a contamination of Heterodera schachtii could not longer be traced in the soils after an one-year period, the root rot inducing fungi appeared sporadically in a biotest (BW-test) till the end of the ob-servation period. The rhizomania virus was found also in the roots of young bait plants till the end of the trial; but the level of salt concentration in soil water seemed to influence the activity of vector fungus Polymyxa betae.