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(一)千方百计保护叶片危害甜菜叶片的病虫较多,为害时间也长。甜菜褐斑病从7月上旬到9月上、中旬都能发生,如防治不及时,会使叶片大量损失。如发现褐斑病病株应及时用1,000倍液托布津喷洒叶片,每次用药液75公斤,连续两次(相隔10天左右);如有甘蓝夜盗虫发生,可用1,000——1,500倍液90％晶体敌百虫喷雾防治。有些地方在甜菜生长后期打叶喂猪,这对甜菜产量和含糖率影响很大。据试验,8—9月份打掉甜菜下部叶片,块根产量降低2％,含糖率降低2—4％。打叶之后,如果温度、湿度适合,还会长出新叶,浪费了块根中积累的营养品
(A) do everything possible to protect the leaves harm beet leaf pest more harmful time is also long. Brown sugar beet disease from early July to September, mid-can occur, such as control is not timely, will make a lot of leaf loss. If it is found brown spot disease strain should promptly with 1,000 times the liquid Tuobu spray leaves, each with 75 kg of liquid twice in a row (about 10 days apart); if cabbage night insects occur, available 1,000--1,500 times the liquid 90 % Crystal trichlorfon spray control. In some parts of the beet leaf-fed pigs later in the growth of beet, which has a great impact on sugar beet yield and yield. According to the test, the lower leaves of beet were knocked down from August to September, the yield of root tuber decreased by 2% and the sugar content decreased by 2-4%. After playing leaves, if the temperature, humidity suitable, but also grow new leaves, wasting the accumulation of nutrients in the roots