甜菜褐斑病是危害甜菜叶片的主要病害之一。宁夏引黄灌区一般年份于6月下旬至7月上旬开始发病,8月上、中旬为发病高峰期,尤其在高温多雨的年份,为害最重,块根减产20%以上,含糖下降2～3度。是我区近年来甜菜产量质量严重下降的重要原因之一。为此我们于1986～1988年对褐斑病进行了化学防治试验,现将试验结果报告如下。 Beetle leaf spot is one of the main diseases that endanger beet leaf. Ningxia Yellow River Irrigation District generally began in late June to early July onset, in August the middle and peak incidence, especially in the hot and rainy years, the most damaging, more than 20% reduction in root yield, sugar decreased 2 to 3 degree. Is one of the important reasons for the serious decline of the yield of beet in our district in recent years. To this end, we carried out the chemical control test on brown spot in 1986 ~ 1988, and the test results are reported as follows.