The school name Atemisia argyi Levl. et Vant. Alias ​​Artemisia. Asteraceae is a perennial herb medicinal plant. Use leaves as medicine. With cold and dampness, warm the bleeding effect. China's northeast, north China, east China, southwest, Shaanxi and Gansu are all distributed.
Symptoms mainly affect the leaves, petioles, and stems. The diseased department has thin or thick white amorphous patches. In severe cases, the whole leaf or plant was covered with white powder, causing the whole plant to appear white.
Pathogen Erysiphe artemisiae Grev. Artemisia annua, belonging to ascomycete subphylum fungi. The ascospores were scattered, spheroidal, with a size of 89-137μm, with 15-48 apical wires and many branches. Ascospores 7-15, ovate, stipitate, size 68.8-81.330.5-43.8 (μm). Ascospores were 2 eggs, ovoid, yellowish, size 20.3-27.515.2-18.8 (μm).
See Chrysanthemum powdery mildew for transmission methods and conditions, and control methods.
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