Powdery Mildew
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关于这种疾病
Powdery mildew is a fungal disease caused mainly by the order Erysiphales, producing a white powdery coating on leaves and new shoots. It is commonly seen on bonsai such as ume, cherry, maple, and rose, and can affect appearance and vigor.
主要症状
- White powdery coating spreads across leaf surfaces
- Affected areas become distorted and curled
- Symptoms tend to originate on new shoots and young leaves
- Severe cases may cause premature leaf drop
主要原因
- Poor air circulation combined with high humidity
- Overly dense foliage trapping stagnant air
- Excess nitrogen fertilization producing overly soft new growth
- Large day-to-night temperature fluctuations in spring and autumn
预防（栽培环境与日常管理）
Position trees in locations with good air flow and thin out overcrowded foliage through formative pruning. Avoid excess nitrogen fertilization and choose drier placement for susceptible species.
相关图鉴
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观察情况，若恶化请咨询专卖店专卖店·园艺可做的处理？
Specialist bonsai nurseries can advise on management approaches tailored to the tree species and severity, including adjustments to pruning practices and fertilization balance.
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