Symptoms of celery leaf spot disease include yellow spots appearing on the leaves, followed by gradual wilting and drying of the foliage. The stems may begin to rot, while brown rot can develop at the root area. In severe cases, the heart and inner leaves start to decay, leading to a decline in plant health and yield.
Prevention and control techniques are essential for managing this disease. First, proper water and nutrient management is crucial. Celery thrives with consistent moisture and adequate fertilization. It's important to keep the soil evenly moist between plants. During each irrigation, applying urea and potassium dihydrogen phosphate can help strengthen the plants, improve their resistance to pests and diseases, and promote healthy growth.
Second, using shade nets can be an effective method to manage light exposure. Celery prefers moderate light conditions, and shade nets help regulate temperature and reduce stress caused by excessive sunlight. This ensures better growth and minimizes the risk of disease development.
For chemical control, it's recommended to apply fungicides at the early stages of infection. A 65% mancozeb suspension (diluted 2000 times) or a combination of chlorothalonil and thiophanate-methyl (1500 times dilution) can be used to effectively control the spread of the disease. Regular monitoring of the crop and timely application of these measures are key to successful disease management.
In addition, practicing crop rotation and ensuring good air circulation around the plants can further reduce the chances of disease occurrence. Removing infected plant parts and maintaining clean growing areas also play a significant role in preventing the spread of leaf spot disease. By combining cultural, physical, and chemical methods, farmers can significantly improve the health and productivity of their celery crops.
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