黄瓜霜霉病,炭疽病,在西安市郊已成为一种毁灭性的病害,1953年与1954年6月初,城市近郊栽培的黄瓜全部因病枯萎死亡,早种的采收期仅十余天,亩产仅数百斤。育苗较晚 Cucumber downy mildew and anthracnose have become a devastating disease in the suburbs of Xi’an. In 1953 and early June 1954, all the cucumber cultivated in the suburbs of the city died due to disease wilting. The harvesting period of early species was only ten days, Only a few hundred kilograms per mu yield. Nursery late