甜菜是我区栽培的主要经济作物之一，最高年份种植面积达１２万亩以上，取得了可观的经济效益和社会效益。但近两年由于迎茬和连作问题，使甜菜褐斑病在我区的各甜菜产区普遍发生，据调查，一般可使块根减产１０％～２０％，含糖降低１～２度。影响了甜菜产量和效益，成为... Beet is one of the main cash crops for cultivation in our district. The planting area in the highest year is more than 120,000 mu, and considerable economic and social benefits have been achieved. However, in the recent two years, due to the problems of continuous cropping and continuous cropping, the occurrence of beet leaf brown spot is common in the beet producing areas in our region. According to the survey, the root yield can be reduced by 10% to 20% and the sugar content decreased by 1 to 2 degrees. Affect the yield and effectiveness of beet, become ...