Viral disease, also known as cramping disease, is the main disease on celery. In the early stage of seedling stage, the leaves show thick, light green mottled or yellow plaques at the beginning, and then become brown necrotic spots. There may also be obvious yellow or light green ring-shaped radial lesions on the edges. In severe cases, the heart leaves are twisted or deformed or the whole leaves are Shrinkage, yellowing, dwarfing of the whole plant, and even death. The disease is transmitted by mites, and it can also be transmitted through contact during manual operation.
Preventive measures: 1. Kill cockroaches and prevent diseases. From emergence to harvesting during the entire period of fertility, it is necessary to do a good job of killing cockroaches.
2. Strengthen field cultivation management. Reasonable close planting, applying organic fertilizer, promoting plant growth and improving disease resistance. In the operation of farming, the hands and tools that have been exposed to the diseased plants are washed with soapy water to prevent contact with infection. The protected area is covered with an insect net to keep the insects out of the shed.
3. Chemical prevention and control. In the early stage of the disease, timely use 20% morpholinium hydrochloride wettable powder (virus A) 500 times solution, 1.5% phytopathogenic emulsion 1000 times solution or 15% virus gram WP 700 times solution spray, every 7 Spray once every 10 days, and spray 2 or 3 times.
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