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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。
Chrysanthemum spot blight (Septoria Chrysanthemella Sacc.) Can occur throughout the year in Guangzhou, especially in May to October the incidence of warm and humid season is even more, low temperature dry season disease occurred suppressed, but no obvious winter. In the field, disease developed from the lower part of the plant to the upper part, and the disease growth and decline increased with the growth of plant protection. However, its development speed was affected by humidity and rainfall. After rainfall, the disease generally increased greatly. None of the 14 common cultivated chrysanthemum varieties tested showed disease resistance. Among them, the lesser-onset breeds were white crushed and Ling-Po fairy; the other moderate-mild ones were the world one, tiger claw yellow, Taihuang, June yellow, Huanghai Chiuyue and Jinbo Chung Tsui; moderately weighted varieties were golden yellow , Li Jin, Japan yellow, sunflowers and blue jasper; the heavier species is purple lotus. From the beginning of the onset, spraying fungicides for 3 to 4 times in a row, combined with good field sanitation, better control effect. Spraying 50% of 50% drospirenol wettable powder and 50% dithizone danshen powder (1000: 500 times) and 45% Chlorothalonil mixed carbendazim suspension (1000 times), control efficiency of 69% and 65.22%, respectively, showed that the mixed spray spraying effect is better than the separate trend.