【摘要】 菊花斑枯病(Septoria Chrysanthemella Sacc.)在广州地区整年皆可发生,尤以5～10月温暖湿润季节发病为甚,低温干燥季节病害发生有所抑制,但无明显的越冬期。在田间病害由植株下部向上部发展,病情消长随植保年龄的增长而增加,但其发展快慢又受湿度和降雨量的影响,通常在降雨之后,病情会较大幅度的增加。 在供测的14个常见栽培菊花品种中,没有一个表现抗病的。其中发病较轻的品种为白碎和凌波仙子;发病中等偏轻的另种为世界一、虎爪黄、台黄、六月黄、黄海秋月和金波涌翠;发病中等偏重的品种为金黄、丽金、日本黄、向阳花开和蓝田碧玉;发病较重的品种为紫荷莲。 从发病初期开始,连续喷施杀菌剂3～4次,并结合做好田间清洁卫生,有较好防效。单独喷施8O％敌菌丹可湿粉500倍液防效可达61.24％;混合喷施50％申基托布津乳油+80％敌菌丹可湿粉(1000:500倍液)和45％百菌清多菌灵混合胶悬剂(1000倍液),防效分别达69％和65.22％,显示出混合喷施较单独喷施防效为优的趋势。更多还原

【Abstract】 The blight leaf spot of chrysanthemum (black leaf spot of chrysanthemum) is one of the most serious diseases in warm season in South China. The disease is usually restrained as temperature decreases from late October, but its dormant stage is usually incospicuous. Higher temperature during the winter can cause the occurrence of the disease. The spot appears In lower leaves first, and then develops upward to the younger ones. When the plant becomes higher and older the disease turns severe but its rate of development js affected by moisture and rainfull. In general, the disease develops rapidly after rain.Among the 14 varieties tested, none of them was resistant, however , the varieties of ’Bai Sui’ and ’Ling Bo Xian Zi’ were found to be slightly susceptable, while ’Zhi he’lian’ found to be very susceptable and others were moderatly susceptable.Field trials showed that spraying with 80% Difolatan wp, 50% Thiophanat-melthyl emusion+80% Difolatan wp and 45% Diconil + carbendazim mixture Colloidal suspension were effective for the control of the disease, and a mixture or alternate use of different fungicicides gave better result.更多还原