甜菜从7月份开始进入生长繁茂期,病、虫、草荒、雨涝等灾害多在这个时期发生,尤其褐斑病和夜盗虫的危害严重。为提高甜菜产量,要抓好中后期的田间管理。1.中耕培土.8月末至9月初,当甜菜老叶枯死,形成开垄时,利用犁中耕培土一次,疏松土壤、消灭杂草、促进块根增长和糖分积累。2.消灭病虫害.①甜菜褐斑病:当气温在15℃以上、连续降雨两天以上时,10～15天以后叶片就会出现病斑;在气温较高、空气湿度较大的情况下,病害将迅速蔓延。田间一旦出现病斑,就应立即喷药,用50％托布津或70％甲基托布律按有效成分配成浓度为0.05％的药液喷雾,每亩喷100斤,每隔15天喷1次,共喷3次。为提高药效,每千 Sugar beet from the beginning of July into the growing lush period, disease, insects, grassland shortage, rain and other disasters and more occurred during this period, especially the brown spot disease and night-stealing serious harm. To improve the yield of sugar beet, we must grasp the field management in the late period. 1. Cultivated soil cultivation.From the end of August to early September, when the beet old leaves died, the formation of ridge, the use of plow tillage soil once, loosen the soil, eliminate weeds, promote root growth and sugar accumulation. 2. Elimination of pests and diseases. ① sugarbeet brown spot disease: when the temperature is above 15 ℃, continuous rainfall more than two days, 10 to 15 days after the leaves appear lesions; higher temperatures, air humidity, The disease will spread rapidly. Once the field spot, you should immediately spraying, with 50% Topaz or 70% Methyl Topis according to the active ingredient dubbed the concentration of 0.05% of the liquid spray, spraying 100 pounds per mu, spray every 15 days 1 times, a total of 3 times spray. To improve the efficacy, every thousand