The recovery of technical sugar beet from traditional virus diseases, and beet rhizomania in the Slovak Republic
1999
Bojnansky, V. | Subikova, V. (Slovenska Akademia Vied, Ivanka pri Dunaji (Slovak Republic). Ustav Experimentalnej Fytopatologie a Entomologie)
Results on aphid-transmitted virus diseases (beet mosaic, beet yellows, beet mild yellowing and their complexex) prevalent in sugar beet seed production region of Slovakia are analyzed. Introduction of new seed production technology (i.e. direct autumn seed sowing and field hibernation) since 1990 has resulted over a period of time in substantial improvement of the health of both seed as well as technical sugar beet crops. The afflictions of beet virus diseases has markedly dropped from average of 40-60% in 1977-1983 to below 10% in 1997. Extremely high occurence of rhizomania before and after 1990 had resulted in the decline of beet crops, sugar content and sugar recovery. Decrease in polarized sugar extraction was registered up to 4.1 t per ha in Slovakia in 1992. After having taken timely measures such as the financial subsidy to the cultivators, introduction of the tolerant cultivars, reduction in the prevalent beet virus diseases has exerted positive influence over a period of time from 1995 in improving the situation which was not evident earlier. The extraction of polarized sugar has registered an increase up to 5.2 t per ha in 1996 and up to 5.35 t per ha in 1997
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