Celery leaf spot blotch, also known as leaf blight or late blight, is a serious disease that commonly affects celery crops in protected areas during winter and spring. If left unchecked, it can significantly reduce yield and quality, making timely prevention and treatment essential for growers.
To manage this disease effectively, several control measures should be implemented. First, it's crucial to promptly remove infected plant parts and collect seeds from healthy, disease-free plants. Practicing a 2-3 year crop rotation helps break the disease cycle, while seed treatments with products like Green Hengheng-1 or Green Hengmiaofu can provide an added layer of protection.
Selecting resistant celery varieties such as Jinnan celery, Celery 3, and Chunfeng can also play a key role in reducing disease impact. In addition, proper agricultural practices are vital—keep the garden clean by removing diseased leaves, use organic manure as a base fertilizer, and ensure adequate boron application to strengthen plant health and resistance.
In protected environments, maintaining good ventilation, temperature control, and humidity levels is important. Watering should be done appropriately to meet the plant’s needs without creating overly moist conditions that favor disease development.
For chemical control, early preventive sprays are recommended. When no symptoms are visible, apply protective sprays at the seedling stage, typically 3-4 cm tall. For effective disease management, fungicides should be applied as soon as signs appear.
Common chemical treatments include:
1. **Smoking agents**: Use 45% chlorothalonil smoke at 200–250 grams per acre, or 15% antiviral smoke agent at 300–400 grams, or 15% bafumide smoke agent at 300 grams.
2. **Dusting**: Apply 5% chlorothalonil dust or 5% antimony dust at 1000 grams per acre.
3. **Spraying**: Mix 75% chlorothalonil wettable powder at a 600-fold dilution, or use Green Hunter II at 800 times. Spray every 7–10 days, applying the treatment 2–3 times in succession. Stop using chemicals five days before harvest to ensure safe consumption.
By combining cultural, biological, and chemical methods, farmers can effectively manage celery leaf spot blotch and maintain healthy, productive crops.
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