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芍药红斑病主要为害叶片和绿色茎。叶片受害后出现针头状的小点,最后扩展成不规则形大斑,正面为暗紫红色,背面为栗褐色;茎上为暗紫红色长圆形小斑。经鉴定病原为 Cladosporium Paeoniae Pass.。病菌生长和孢子萌发最适宜的温度为20—24℃。孢子在自来水和蒸馏水中萌发率为57.7％和43.0％,而在25—50％的芍药及牡丹煎汁中萌发率提高到90％左右。人工接种试验证明此菌可自伤口侵入,也可无伤侵入。在20—24℃条件下潜育期5—6天,8℃时潜育期延长到14天。叶片上病斑出现后扩展很慢,经2至2个半月才形成子实体。此病的初次侵染过程很长,并可能只有一次再次侵染。初侵染源是病株残茎和散落在地面上的病残茎及病果壳。病害的发生与侵染源的数量有密切关系。在不伤及芽的情况下将地上部分清除乾净,并移栽到无病地,或在冬季加垫厚度为15厘米左右的肥土;并于植株萌发初到开花前喷洒1000倍多菌灵3次,能有效地防治此病的发生。
Peony erythematosus is the main damage leaves and green stems. After the victim blade appeared needle-shaped dots, and finally expanded into irregular large spot, the front is dark purple, chestnut brown on the back; stems are dark purple oval small spots. The identified pathogen is Cladosporium Paeoniae Pass. The most suitable temperature for germ growth and spore germination is 20-24 ℃. The germination rate of spores in tap water and distilled water was 57.7% and 43.0%, while the germination rate was increased to 90% in 25-50% of the peony and peony. Artificial inoculation test proved that the bacteria invaded from the wound, but also without injury. Under the condition of 20-24 ℃, the incubation period is 5-6 days, and the incubation period is extended to 14 days at 8 ℃. Leaf lesions appear after the expansion is very slow, after 2 to 2 and a half months to form fruiting bodies. The initial infection of the disease is long and may only be repeated once. The initial source of infection is the diseased stumps and diseased stalks and diseased shells scattered on the ground. The incidence of diseases and the source of infection are closely related. Without hurting the buds of the ground part of the clean and transplanted to disease-free land, or padded in winter thickness of about 15 cm of soil; and the beginning of the plant germination before spraying 1000 times more bacteria Spirit 3 times, can effectively prevent the occurrence of the disease.