问:西洋参生长期间有哪些病害?答:西洋参生长期间的主要病害有立枯病、疫病、猝倒病、黑斑病(斑点病)、根锈腐病等.立枯病发病部位在茎基部干湿土层交界处,病菌侵染幼茎后出现黄褐色凹陷条斑,幼茎逐渐腐烂,进而倒苗死亡.温度低、湿度大、通风不良、苗长势弱时易发立枯病. Q: What are the diseases during the growth of American ginseng? A: The main diseases during American Ginseng growth are blight, blight, damping-off disease, black spot disease (spot disease), root rust, etc. The incidence of blight in the stem base At the junction of wet and dry soil layer, the yellowish-green streaks appear after the infection of young stems by bacteria, and the young stems gradually decay, and then fall in the frying seedlings, causing low temperature, high humidity and poor ventilation.