Protection of Celery Virus Disease in Protected Areas
Viral disease, also known as cramps, is a major disease on celery. The disease started from the seedling stage and showed thick, light green mottled or yellow patches at the early stage of the leaves, showing obvious yellow spotted leaves, followed by brownish necrotic spots, and 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. Relying on locust transmission, contact with humans can also spread the virus when they are manipulated. The cultivation conditions are poor, the management is extensive, and the drought, fertilizer, water, and maggots are heavy. The virus is mainly wintered on protected areas of celery and other perennial roots.
Control methods: 1 strengthen the cultivation and management. The susceptibility of celery to the seedling stage, prevention of disease at the seedling stage is the focus of prevention and control, and measures need to be taken to reduce the seedbed temperature, reduce the light, reasonably irrigation, remove diseased seedlings, and cultivate strong seedlings. Drought prevention, flood prevention, timely watering and fertilizing, promote robust growth of plants, and increase resistance to disease. 2 cure and prevent disease. During the whole growing season, attention should be paid to the timely control of aphids. 3 At the beginning of the disease, spray antiviral agent No. 1 200 to 300 times or 20% virus A WP 500 times.
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