叶枯病对茼蒿为害比较严重,露地和保护地均能发生。在保护地中发生比露地更严重一些。茼蒿叶枯病只侵染叶片,病斑圆形或不规则形,中央浅灰色,边缘褐色或浅褐色,湿度大时叶背面和正面具有黑色霉状物,即病原菌的分生孢子小梗和分生孢子。后期病斑相互连合成大块病斑,导致叶片枯死。茼蒿染病后严重降低茼蒿产量和品质。 Leaf blight damage to Chrysanthemum more serious, open field and protected areas can occur. Occur in the protected area more serious than exposed. Artemisia leaf blight only invaded leaves, round or irregular spotted lesions, the central light gray, brown or light brown edge, humidity and leaf back and front with black mildew, namely the pathogen conidia and small stems Conidia. Post-lesion associated with each other into a large piece of lesions, leading to dead leaves. Artemisia chinensis significantly reduce the yield and quality of Artemisia selengensis.