沙打旺黑斑病(Diachorella sp.)是我国发现的一种沙打旺新病害,主要危害植株地上部分,在叶和茎上形成大量黑斑。该病在黄土高原地区对沙打旺造成严重威胁。病害于6月中下旬开始发生,7月中旬进入发病高峰期,当年播种的发病较晚。生长年限越长受害越重,二三年生的病株率常达100％。受害重的植株矮化1/4,落叶率增加1倍以上,花序减少95％,叶片的粗蛋白质减少23％,粗脂肪和一些矿质营养等也明显减少。 Diachorella sp. Is a new disease of sand weeds found in our country. It mainly harms the aerial parts of plants and forms a large number of dark spots on leaves and stems. The disease poses a serious threat to Asthma in the Loess Plateau. Diseases began in late June, mid-July into the peak incidence, the incidence of sowing later that year. The longer the growing years, the harder the victim, the rate of diseased plants in two or three years often reaches 100%. The hardest plants dwarfed by 1/4, the deciduous rate increased by more than 1 folds, the inflorescence reduced by 95%, the leaf crude protein decreased by 23%, and the crude fat and some mineral nutrition decreased significantly.