Abstract
This study was conducted to evaluate factors affecting severity of the sugar beet leaf spot disease i.e. planting date, sugar beet cultivars and frequencies of fungicide applications at Safi Abad Agricultural Research Center Dezful –Iran during 2004 to 2006. The experimental design was Randomized complete blocks with (split) plot. The Main Plots were planting date on October and November; the sub plots were sugar beet cultivars and applications of fungicide (Mancozeb) frequencies. Two control treatments were used in this experiment. Based on the root yield the results in 2004-2005 showed the significance of planting date (5% level), Mancozeb spraying and cultivar treatments (both at 1% level). The Results obtained indicated that with early planting and with three or four times of fungicide applications sugar beets leaf spot disease would be manageable and higher quality and quantity of sugar beet yield would be expected.
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