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Rhizoctonia root and crown rot of sugar beet is one of the important diseases in most beet production areas of Iran. Use of resistant varieties is an effective way to control this disease in infected fields.In this research, six new foreign sugar beet varieties along with threeforeign resistant, one local tolerant (Ekbatan) and one susceptible checks were evaluated in four naturally infected areas (Mashad, Shiraz, Hamedan and Qazvin) for two years (2016-17) in a randomized complete block design with 4 replications. These varieties were also evaluated for rhizoctoniaresitance in microplots of Hamedan. In the naturally infected areas, yield and quality traits were measured after harvest. Results showed that thevarieties significantly differed for root yield, white sugar yield and sugar content. Means comparision revealed that the varieties WAWILOW, MOLIERE, GECKO and BETA414with 7.41, 7.72, 7.03 and 8.04 t.ha-1 white sugar yield, respectively, were significantly superior to the mean of the resistant checks (6.31 t.ha-1).With respect to sugar content, only the variety HADJU with 17.72% had significantly higher sugar content than the mean of the resistant checks (17.14%). Considering all the experiments conducted in four locations and two years, white sugar yield, yield stability and disease infection, the varietiesWAWILOW, MOLIERE, GECKO and BETA414were identified as the most suitable varieties which could be recommended for sowing in the infected areas.Keywords: Varieties, sugar beet, resistance, Rhizoctonia
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