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黄金菊叶斑病防治方法

美琪爱拍照
2017-05-24
#黄金菊叶斑病 是黄金菊常见病害之一。

症状

黄金菊叶斑病有2种症状类型。①灰斑病:发病初期,感病叶片上产生圆形或近圆形斑点,直径2-5mm,褐色。以后病斑中央灰褐色,边缘暗褐色,病斑两面均可产生灰色霉状物,即病原菌分生孢子及分生孢子梗。发病后期,病斑联合成片,病情发展很快,感病植株提前枯死。②轮纹斑病:感病黄金菊叶片上产生椭圆形褐色轮状病斑。

病原

引起灰斑病的病原为黄金菊尾孢(Cercospora calendulae Sacc.),引起轮纹斑病的病原为链格孢菌(Alternaria sp.),上述2种炳原菌均属半知菌亚门、丝孢纲、丝孢目真菌。 发病规律 病原菌以菌丝体在病落叶中越冬。第二年春季产生分生孢子,分生孢子借气流传播,从气孔侵入;条件适宜时,病害蔓延很快,可导致病株早期死亡。几乎所有黄金菊品种都能感病,但生长不足1个月的小苗抗病力强。

防治方法:

①减少侵染来源:黄金菊开花结束后,彻底清除病残体,集中销毁。 ②培育苗壮,以增强植株的抗病能力。 ③药剂防治:黄金菊定植后,可喷施1:1:100的波尔多液,或50%福美双可湿性粉剂500-800倍液,或65%代森锌可湿性粉剂500倍液,或50%苯来特可湿性粉剂300-500倍液防治。
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