萝卜叶枯症在齐齐哈尔市沙质土地带发生的较多,危害面积较大.被害的萝卜表现为生长延迟,肉质硬化,辣味重等商品价值降低,我们在1989年对栽培条件与发病的关系及防治措施进行了多项试验. 一、症状叶枯症一般在展叶6片以上的萝卜,中位叶上发生,最初症状在叶缘尖边呈黑紫色,以后从整个的叶缘向叶中心进展,叶脉间变为黑褐色,进而使叶脉从内向外变为紫色.在急剧发生时,最初叶脉间变为水浸状,2 Radish leaf blight occurred in the sandy land area of ​​Qiqihar more harm to the larger area.The victimized radish showed growth retardation, sclerosis, spicy weight and other goods to reduce the value of, in 1989 we cultivated conditions and the incidence of Relations and prevention and treatment of a number of tests. First, the symptoms of leaf blight generally in the leaf more than 6 radish, the median leaf occurs, the initial symptoms in the tip edge of the black purple, and later from the entire leaf edge The center of the leaf progresses, the dark brown between the veins, which in turn causes the veins to turn purple from the inside to the outside. In the event of a sharp onset, the initial veins become flooded, 2