A comparison of quantitative and qualitative yield on some resistant cultivars to rhizomania disease of sugar beet (Beta vulgaris L.) in to qualification of alloy and unspotted to rhizomania

Rhizomania or root madness is one of the main diseases of sugar beet (Beta vulgaris L.) and it is common all around the world. The disease usually causes more than 50% of product yield loss and even 100% in more acute cases. An experiment on more than 11 Rhizomania resistant cultivars, randomly placed on blocks with three replications (in two locations: Fariman Sugar Mill Research Farms (contaminated and free of contamination, Khorasan Razavi) was conducted in 2012 to measure resistance of the specimens. The results showed, for station 1, Merak and 006 cultivars were the most resistant cultivars concerning development of root per hectare. In addition, Merak, 006, Azar, Rozir, Delta, and Native Color cultivars had the maximum yield/ha. Moril cultivar had the lowest root yield and genotypes 004, Iranian Razifort, 005, and Zarghan had the lowest yield. However, in case of the station 2, 005 and 004 cultivars had the maximum and minimum root and sugar yields respectively.