叶斑病
基本信息 / Basic Information
| 中文 | English |
|---|---|
| 叶斑病 | Leaf spots |
| 病原：尾孢菌属 (Cercospora spp.)，也可能由 Alternaria, Septoria 等真菌引起 | Pathogen: Cercospora spp., also caused by fungi such as Alternaria and Septoria |
| 类型：真菌性叶部病害 | Type: Fungal leaf disease |
主要症状 / Main Symptoms
| 中文 | English |
|---|---|
| 叶片初现针尖大小褐色或黑色小斑点 | Tiny brown or black pinpoint spots first appear on leaves |
| 病斑逐渐扩大，呈圆形或不规则形，中央灰白或褪色，边缘褐色 | Spots enlarge into circular or irregular lesions with grayish/bleached centers and brown margins |
| 病斑融合，造成叶片大片坏死，叶片枯黄、脱落 | Lesions coalesce, causing large necrotic areas, leaf yellowing, and defoliation |
| 严重时植株早衰，产量和品质下降 | Severe infections cause premature senescence, reducing yield and quality |
发生规律 / Occurrence
| 中文 | English |
|---|---|
| 在温暖潮湿或有长时间露水的环境下流行 | Prevails under warm, humid conditions or prolonged leaf wetness |
| 密植、通风不良、肥水管理失衡易加重病害 | Dense planting, poor ventilation, and nutrient imbalance aggravate severity |
| 常在植株生长中后期发生，易与早衰混淆 | Often occurs in mid-to-late growth stages, easily mistaken for natural senescence |