Celery leaf spot blotch, commonly referred to as leaf blight or late blight, is a significant disease that affects celery crops in protected environments during the winter and spring seasons. Prompt prevention and treatment are essential to avoid economic losses and ensure healthy plant growth.
To manage this disease effectively, several control measures can be implemented:
1. **Sanitation and Seed Management**: Immediately remove infected plants and collect seeds from healthy ones. Implement a 2-3 year crop rotation system and disinfect seeds using products like Green Hengheng-1 or Green Hengmiaofu. This helps reduce the risk of disease spread.
2. **Resistant Varieties**: Planting resistant celery varieties such as Jinnan celery, Celery No. 3, and Chunfeng can significantly lower the chances of infection.
3. **Cultural Practices**: Maintain clean fields by removing diseased leaves promptly. Use organic manure as a base fertilizer and apply boron supplements to enhance plant health. Proper field management, including cultivating strong seedlings, improves the plant's natural resistance to diseases.
4. **Greenhouse Management**: In protected areas, proper ventilation, temperature control, and humidity regulation are crucial. Watering should be done in appropriate amounts to meet the growth needs of celery while minimizing conditions favorable for pathogen development.
5. **Chemical Control**: Early preventive spraying is key. When no signs of disease are present, apply protective sprays at 3-4 cm height on seedlings. For early disease intervention, use approved pesticides.
- **Fumigation**: Apply 45% chlorothalonil smoke agent at 200–250 grams per acre, or 15% antiviral smoke agent at 300–400 grams, or 15% bafumide smoke agent at 300 grams.
- **Dusting**: Spray 5% chlorothalonil dust or 5% antimony dust powder at 1000 grams per acre.
- **Spraying**: Use 75% chlorothalonil wettable powder diluted 600 times, or Green Hunter II diluted 800 times for both prevention and treatment. Apply every 7–10 days, with 2–3 consecutive applications. Stop using chemicals five days before harvest to ensure safe produce.
By combining these strategies, growers can effectively manage celery leaf spot blotch and maintain high-quality yields throughout the growing season.
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