甜菜褐斑病历年来在我国东北甜菜栽培区普遍发生,尤其在黑龙江南部和东南部地区发生尤为严重,根据1957年全国农展会的资料,因有褐斑病危害,可使产量下降10—20%,糖度下降一度。一、症状:病害的症状十分显著,在一年生甜菜的叶片上,形成为数众多的圆形白色斑点,大小约1—3毫米,其周围具有褐色或紫色由花青素形成的红环边缘。斑点的大小,位置及其特性按品种特性及外界条件可以有 Beet brown spot disease over the years in our beet cultivation areas in Northeast China, especially in southern and southeastern Heilongjiang particularly serious occurrence, according to the 1957 National Agricultural Exhibition data, due to the brown spot disease hazards, the output can be reduced by 10-20% , Sugar degree decreased once. First, the symptoms: the symptoms of the disease is very significant, in the annual beet leaves, the formation of a large number of round white spots, the size of about 1-3 mm, surrounded by brown or purple anthocyanins formed by the red ring edge. The size, location and characteristics of the spots can be based on variety characteristics and external conditions