When the celery spotted disease occurred, the lesions were contiguous and the leaves were dry. The petiole develops a fusiform or stripe-like lesion, grayish-brown, slightly sag, and when the humidity is high, a gray mold layer appears, and the petiole is severely broken. The reason is that greenhouse cultivation celery, due to the large temperature difference between day and night, a long time condensation, easy to disease. In addition, weak plants are also susceptible to disease.
Prevention techniques: 1 For more than 2 years of rotation, shade seedlings should be shaded in summer, be close-packed, and diseased plants removed as soon as possible. 2 Use disease-free seeds and soak in warm water at 48°C for 30 minutes. 3 Strengthen fertilizer and water management, timely ventilation, and control air humidity. 4 At the beginning of the disease, spray 50% carbendazim WP 500 times, or 50% acetaminophen wettable powder 1300 to 1500 times, or 70% dexamethasone WP 400 to 500 times, or 77% can kill 500 times the wettable microparticles, or 80% of the wettable powder 800 times spray. 5 with 10% chlorothalonil smoke agent 200 ~ 250 grams of smoke control. 6 Use 5% chlorothalonil dust to spray 1000-1100 grams per 667 square meters.
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