Grey mold Symptoms: A gray mold adheres and weakens from the lesion. The flower part is especially common. Preventive measures: Keep well-ventilated and often cut off withered leaves. Countermeasures: Cut off the existing lesions, especially withered flowers. powdery mildew Symptoms: The surface of leaves and stems is white as if sprinkled with wheat flour. Mold is the cause. Preventive measures: Keep well ventilated, often cut off withered leaves and control the amount of nitrogen fertilizer used. Countermeasures: Cut off the existing lesions. Black spot disease Symptoms: Black spots appear on leaves, etc., and mold is the cause. Preventive measures: Keep well-ventilated and often cut off withered leaves. Symptoms: The seedlings are withered and wilted, soil, and often trimmed for their cause. Countermeasure: Pull out the plants that have been infringed and plant the calendula intercropping. Symptoms: The red leaves appear brown and rot. Preventive measures: Strengthen ventilation management, taking care not to touch the leaves and stems to the soil surface. Countermeasure: Remove the lesion and spread a small amount of vinegar. Soft rot Symptoms: The plant's base rots and the plant body softens. Mosaic disease Symptoms: Patchy patterns appear on leaves and flowers.
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Countermeasures: Cut off the existing part of the lesion, and thin layer of edible vinegar.
Blight
Prevention method: Use clean soil and always trimmed withered leaves.
Degerosis
Prevention methods: Strengthen ventilation management, cut off dead leaves, and thinly sprinkle a layer of vinegar.
Countermeasure: Spray a small amount of vinegar.
Preventive methods: Do not use diseased seedlings.
Countermeasures: Remove the diseased seedlings and burn them.