Symptoms: The disease can occur during the whole growth period of celery, and the most serious disease is the seedling stage. In the early stage of infection, chlorotic spotted leaves appeared on the leaves, gradually developed into yellow-green mottled or yellow patches, and later turned brown with dead spots. Severe leaf curling, deformity, and dwarfing of plants. 2 disease conditions: in the field through the locust spread. The growth of celery such as high temperature and drought, lack of water and fertilizer, aphids serious, severe disease. 3 Prevention methods: Strengthen field management, rational fertilization; timely watering in high temperature season, drought prevention and drainage; do a good job of aphid prevention and control to reduce the transmission medium. Chemical control: Spray 20% virus A wettable powder 500 times liquid, or 1.5% plant disease sorrow emulsion 1000 times early in the disease.
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