一、发病症状 几种肉质根菜作物的缺砌症状如下: 1,白萝卜:发病植株外形一般正常,但根内的形成层和木质部组织呈灰白色或褐色,严重缺硼时植株矮化,顶端生长点死亡,叶片少而小,且畸形。根不发达,扭曲,中心的肉质部分呈水浸状,甚至髓部腐烂或空心。肉质根表面粗糙。 2.大头莱:植株生长一般正常,肉质直根也能正常发育膨大,但其形成层、茎芯部黑褐化、木栓化,轻时黑褐化较淡,重时则周边形成层全部黑褐 First, the symptoms of symptoms of several fleshy root vegetables lack of symptoms are as follows: 1, white radish: the onset of plant shape is generally normal, but the formation of roots and xylem tissue was gray or brown, dwarf plants in severe boron deficiency, top growth Death, leaves small and small, and deformity. Roots underdeveloped, distorted, the center of the succulent part was flooded, and even the decay or hollow pith. The fleshy root surface is rough. 2. Tau Lai: Plant growth is generally normal, fleshy root can also normal development and enlargement, but the formation of layers, the stem core dark brown, wood bolt, light dark brown lighter, heavy when the formation of the surrounding layer of all Dark brown