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月季枯枝病症状此病通常发生于枝干部位,病斑最初为红色小斑点,后逐渐扩大变成深色,病斑中心变为浅褐色。病斑周围褐色和紫色的边缘与茎的绿色对比明显,病菌的分生孢子在病斑中心变成褐色时出现,随着分生孢子器的增大,茎表皮出现纵向裂缝。发病严重时,病部以上部分枝叶萎缩枯死。病原及发病规律病原为蔷薇盾壳霉(coniotnyriumfuckelii)。病菌以菌丝或分生孢子器在病枝上越冬。翌年产生分生孢子借风雨传播,该病菌一般从伤口侵入。嫁接及修剪时的切口易感染此病。
Symptoms of Rough Lathyroposis The disease usually occurs in the branches, lesion was originally a small red spots, and then gradually expanded into a dark, lesion center becomes light brown. The green and brown edges of the brown and purple spots around the lesion were obviously contrasted with the green of the stem. The conidia of the pathogen appeared brown at the center of the lesion. With the increase of the conidia, longitudinal cracks appeared in the epidermis of the stem. When the disease is serious, the diseased part of the above branches and leaves shrinkage and die. Pathogen and pathogenesis The pathogen is the genus Rosa rugosa (coniotnyrium fuckelii). Pathogenic bacteria in the mycelium or conidia wintering branches. The following year produces conidia spread by wind and rain, the bacteria usually invaded from the wound. The incision at grafting and pruning is susceptible to the disease.