The celery spot blotch, also known as leaf blight, late blight, commonly known as "fire dragon", is a common fungal disease on celery in winter and spring protected areas, and has a great influence on the yield and quality of celery. Low-temperature, high-humidity environmental conditions are extremely conducive to the occurrence and prevalence of the disease.
The disease mainly damages the leaves, followed by the petioles and stems. When the leaves were damaged, light brown oily spots first appeared, and then gradually expanded. The expanded lesions show two types: one is a small-spot type, in which the lesions are small, generally 0.5 to 2 mm in diameter, and no more than 3 mm in diameter. The lesions are yellow-brown at the edges of the lesions and grayish-white in the middle. From the old leaves, after the development of new leaves. Many small black spots (conidia) are formed on the lesions. The other is a large-spot type, with large lesions, up to 3 to 10 mm in diameter, with multiple lesions, grayish-brown in the middle, red-brown edges, and small black spots on the lesions. On the petiole and stem, the lesions are oblong, gray-brown and slightly sunken, with dense black spots on them. Plants that were damaged by spot blight showed premature leaf dryness, obstructed plant growth, and reduced commercial quality.
Prevention of celery spot blight, pay attention to balanced fertilization in production, the base fertilizer to apply adequate decomposition of organic fertilizer, topdressing fertilizer to increase phosphorus, potassium, control the amount of nitrogen fertilizer, pay attention to supplement the trace fertilizer, enhance plant resistance. Timely removal of diseased plant debris, pay attention to ventilation cooling and humidity, daytime temperature control at 15 °C -20 °C, more than 20 °C when the timely release of air, night temperature control at 10 °C -15 °C. When flooding, flood irrigation is not allowed. In the early stage of disease, use 70% mancozeb WP 600 times, or 50% carbendazim WP 600-800 times, spray once every 7-10 days, spray 2-3 times, Have a good preventive and therapeutic effect. In case of high humidity or rainy weather, aerosol or dust can be used for prevention and control.
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