Viral diseases are the main diseases on celery, and vegetable farmers should pay attention to prevention. Virus disease began to appear at the seedling stage. The leaves showed thick, light green mottled or yellow patches at the initial stage. The symptoms were obvious yellow macules, followed by brownish necrotic spots. There may also be sharp yellow or light green ring-shaped radial lesions. In severe cases, distorted heart leaves or the whole plant leaf shrinkage is not long, yellow, dwarf, petioles twisted, dwarfing the whole plant, and even death.
The disease can occur during the whole growth period of celery, and the incidence of disease at the seedling stage is heavy. By locust transmission, contact can also be transmitted when handled manually. Poor cultivation conditions, extensive management, drought, lack of fertilizer, water, aphids and more incidence of disease. The virus is mainly wintered on protected areas of celery and other perennial roots. Viruses in high-temperature and drought conditions are suitable for the onset of temperatures ranging from 15°C to 38°C and relative humidity below 80%.
Preventive measures: 1. Sputum prevention and disease prevention. Debris is the key to prevent the spread of viral diseases. From the time of emergence and harvesting during the entire period of birth, we must do a good job of eliminating fleas, and it is especially important to eradicate lice.
2. Strengthen field cultivation management. Timely sowing, reasonable dense planting, adequate organic basal fertilizer, strengthening fertilizer and water management, promote plant robustness, and increase disease resistance. During agricultural operations, hands and farm tools that have contacted infected plants should be washed with soapy water to prevent infection. Protected areas use insect nets to cover insects outside the shed.
3. Chemical control. From the beginning of onset, use 20% morpholinium WP (virus A) 500-600 times, 1.5% phytoalexin 1000 times, 0.1% zinc sulphate solution or 15% Viral WP 700-1000 times liquid spray, spray once every 7-10 days, continuous spray control 2-3 times.
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