十字花科蔬菜黑腐病,由黄孢杆菌属引起的一种细菌性病害,秋播及越冬蔬菜发生普遍。近年来,据广大菜农反应,该病对甘蓝和花椰菜、萝卜的为害较重,有些地区常造成相当严重的损失。一、侵染途径。黑腐病是一种侵害维管束的病害。其侵入途径主要有以下几种:一是病菌在种子内附着在种子表面,随着种子萌发侵入子叶或幼根,引起发病;二是病菌在病残体上,或随病残体遗留在土壤中越冬。从伤口侵入根部,或经 Black rot of cruciferous vegetables, a bacterial disease caused by the genus Xanthomonas, autumn sowing and overwintering vegetables are common. In recent years, according to the response of the majority of farmers, the disease is more damaging to cabbage and cauliflower and radish, and some areas often cause rather serious losses. First, the route of infection. Black rot is a disease that damages the vascular bundle. The main ways of its invasion are the following: First, the bacteria in the seed attached to the seed surface, with the seed germination invasive cotyledons or young roots, causing the disease; Second, the bacteria in the sick or with the residual disease left in the soil In the winter. Invaded from the wound root, or by