前言萝卜(Raphanus Sativus L.),是分布广、栽培面积大、供应期较长的重要秋菜之一。但近年来由于病害,特别是黑腐病[Xanthomonas Compestris(Pammel)Dowson]的严重危害,使肉质根变成“黑心”而失去食用价值者常达20%左右,有的竟达到30～50%,使生产蒙受重大损失;有的产量虽较高,但品质差。为解决这个问题,我们先后对从国内外引入的32份原始材料进行了试验观察,择其优良者作亲本,选 Preface Radish (Raphanus Sativus L.), is widely distributed, large cultivation area, the supply of one of the important autumn vegetables. In recent years, however, the severity of diseases, especially black rot [Xanthomonas Compestris (Pammel) Dowson], has caused the fleshy roots to become “black hearts”, often up to 20% of their valuelessness, while others have reached 30 to 50% , So that production suffered heavy losses; some yield is higher, but poor quality. In order to solve this problem, we conducted experiments on 32 raw materials imported from home and abroad, selected their elite as their parents, and selected them