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一、分布和为害情况一九五四年以前,我国还没有关于甜菜黄化毒病流行的资料,这一病害已经广泛地流行在欧美各国,成为甜菜上比较麻烦的病害之一。随着甜菜栽培面积的扩大而迅速漫延。在我国所有的甜菜栽培区程度不同地普遍发生。内蒙地区发生特别严重,一般年份发病率达50～60％,个别地区或个别地块高达90～100％。黄化毒病的流行,不仅显著降低种子、块根产量和块根含糖率,而且给甜菜的贮藏、加工增添不少困准,增加大量的蜜。降低纯度,减少产糖量。从一九六八年至一
I. Distribution and Harmful Situation Before 1954, no information on the epidemic of beet yellow virus was yet available in our country. This disease has been widely prevalent in many countries in Europe and the United States and has become one of the more troublesome diseases on sugar beet. With the expansion of beet cultivation area and rapidly spread. All beet cultivation areas in our country have different levels of occurrence. Inner Mongolia occurred particularly serious, the average annual incidence of 50 to 60%, individual areas or individual plots up to 90 to 100%. The epidemic of yellow virus not only significantly reduces the seed, root tuber yield and root tuber sugar content, but also adds a lot of difficulties to the storage and processing of beet and increases the amount of honey. Reduce purity, reduce sugar production. From 1968 to one