豫南板栗幼树白粉病的防治研究

The research report of prevention and control of chestnut saplings' powdery mildew in south Henan province

为防治幼龄板栗树白粉病，进行了 ５ 年的系统试验。田间试验和室内分析表明，采用加强栽培管理、改善栗园干旱状况和通风透光条件、休眠季喷石硫合剂、生长季喷波尔多液并注意防范邻近同科（属）植物病菌传入的系统操作方法，可使板栗幼树白粉病的发生率接近零。

During the past five years, systematic operations have been carrried out to prevent and cure the powdery mildew of chestnut saplings. Both field tests and laboratory analgses demenstrat that thanks to the improvement of the cultivation control and of the irrigation during dry seasons as well as the betterment of illumination and aeration, and thanks to the use of Bordeanx mixture during growing seasons and lime sulphur, rest seasons, and also thanks to the more importance attached to preventing the spread of the germs from plants of the same family (genur) in neighborhoods,——thanks to such a systematic method of operation, the morbidity of incidence of disease can almost be decreased into zero.