Effect of Different Planting Dates on Decrease Curly Top Disease Damage in Sugar beet (Beta vulgaris L.)
2005
Ashraf Mansoori, G.R. | Darabi, S. | Taghi-Zadeh, M. | Jowkar, L. | Khajeh, A.
Curly top virus disease causes high damages to sugar beet crop. One way to decrease the damages of this disease is by using better agricultural management schemes, through selection of suitable planting date. In order to investigate the effect of different planting dates, seed disinfection withGauchoandsprayingtheplants by dimethoate on reducing the damages of this disease, an experiment using split- split plots( with RCBD as the base design) consisting of 16 treatment in 4 replications was conducted in Fasa area for two years (2001- 2002). In main plots the treatments with or without spraying plant or seed disinfection, in sub- plots different planting dates and in subsubplots the sensitive (IC1) and tolerant (16402) cultivars were located. In each plot, the cultivars were planted in 4 line with 8 m length. During the growing seasons, parameters such as the number of infected and noninfected plants, the number of lost plants ; and after harvest characters such as wet weight of roots, wet and dry weight of areal parts, sugar content, Na, K and N content, purity, white sugar yield and sugar content were measured. The results showed that the percent of the infected sugarbeet plants by curly top disease in treatment with disinfected seeds and spraying was less than other treatment. The cultivar 16402 in comparison with IC1 had the lowest infection (23.5%). The effect of spraying the plant, planting date and cultivar on root yield and areal dry matter was highly significant. The maximum yield was obtained for cultivar 16402 and planting time of 6 th. The effects of the abovementioned treatments on sugar content, white sugar yield and purity was significant. The cultivar 16402 which was planted on 5 th April had the maximum white sugar yield (5.58 ton/ha).
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