[Symptoms] This disease occurs during the entire growth period of celery, and it is heavier at 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. In severe cases, the leaves curl and shrink, the heart leaves are distorted and the plant growth is inhibited and dwarfed.
[Implications of the disease] Two viruses are mainly wintered on protected areas of celery and other perennial roots. When the environmental conditions are appropriate, it causes the disease. It spreads in the field mainly through aphids. It can also cause part of the transmission of the virus through contact friction. During the growth period of celery, high temperature and drought, lack of water and fertilizer, and locust occurrence are serious and serious diseases occur.
[Control methods]
1. According to local conditions, choose heat-resistant varieties, timely sowing, to prevent infection at seedling stage. Severe disease seedlings were removed in time to reduce the source of infection.
2. Strengthen field management. Rational fertilization, timely watering in high temperature season, pay attention to drought prevention and drainage, enhance plant resistance to disease. During the growth period, we will continue to do a good job of prevention and control of locusts and reduce transmission of viruses.
3. At the beginning of the disease, spray the antitoxic agent l 200-300 times, or 20% virus A WP 500 times, or 1.5% phytosanitary emulsion 1000 times.
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