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近年来,不少蔬菜基地的十字花科蔬菜普遍发生根肿病,特别是水稻田栽种的榨菜、芥菜等蔬菜发病尤为严重。蔬菜在苗期即可感病受害,严重时甚至死亡;成株受害后,根部肿大,随后很快腐烂,全株枯萎死亡,给生产造成很大损失。1.症状发病初期病株生长迟缓、矮小,基部叶片常在中午萎蔫,早晚恢复。病株根部肿大呈瘤状,主根上的瘤多靠近上部,呈球形或近球形,表面凹凸不平。粗糙,后期表皮开裂;侧根上的瘤多呈圆筒形,手指状;须根上
In recent years, many vegetable cruciferous root vegetables widespread occurrence of clubroot disease, especially paddy mustard, mustard and other vegetables planted in particular is very serious. Vegetables at the seedling stage can be susceptible victims, even when dead; adult damage, the roots swollen, and then quickly decay, the whole plant withered death, resulting in a great loss of production. 1. Symptoms Early onset of disease growth retardation, short, basal leaves often wilting at noon, sooner or later recovery. The diseased root swollen to tumorous, the main root of the tumor near the upper part of the more spherical or nearly spherical, uneven surface. Rough, late epidermis cracking; lateral root of the tumor mostly cylindrical, finger-shaped; fibrous